共用题干
第三篇
Longer Lives for Wild Elephants
Most people think of zoos as safe places for animals,where struggles such as having difficulty finding
food and avoiding predators（猛兽）don't exist. Without such problems,animals in zoos should live to a ripe
（成熟的）old age.
But that may not be true for the largest land animals on Earth.Scientists have known that elephants in
zoos often suffer from poor health.Sometimes,they even become unable to have babies.
To learn more about how captivity（圈养）affects elephants, a team of international scientists compared
the life spans of female elephants born in zoos with female elephants living outdoors in their native lands.
Zoos keep detailed records of all the animals in their care,documenting factors such as birth dates,illnes-
ses,weight and death.These records made it possible for the researchers to analyze 40 years of data on 800
African and Asian elephants in zoos across Europe.The scientists compared the life spans of the zoo-born fe-
male elephants with the life spans of thousands of wild female elephants in Africa and Asian elephants that
work in logging camps（伐木场）, over approximately the same time period.
The team found that female African elephants born in zoos lived an average of 16.9 years. Their wild
counterparts who died of natural causes lived an average of 56 years一more than three times as long. Female
Asian elephants followed a similar pattern. In zoos,they lived 18.9 years,while those in the logging camps
lived 41.7 years.
Scientists don't know yet why wild elephants seem to get on so much better than their zoo-raised coun-
terparts.Georgia Mason,a biologist at the University of Guelph in Canada who led the study,thinks stress
and obesity（肥胖症）may be to blame. Zoo elephants don't get the same kind of exercise they would in the
wild,and most are very fat. Social lives of elephants are also much different in zoos than in the wild,where
they live in large herds and family groups.
The study raises some questions about acquiring more elephants to keep in zoos.While some threatened
and endangered species living in zoos reproduce（生殖）successfully and maintain healthy populations,that
doesn't appear to be the case with elephants.
It can be inferred from the last paragraph that______________.
A:zoo-born elephants should be looked after more carefully
B:zoos should keep more animals except elephants
C:it may not be wise to keep elephants in zoos
D:elephants are no longer an endangered species
第三篇
Longer Lives for Wild Elephants
Most people think of zoos as safe places for animals,where struggles such as having difficulty finding
food and avoiding predators（猛兽）don't exist. Without such problems,animals in zoos should live to a ripe
（成熟的）old age.
But that may not be true for the largest land animals on Earth.Scientists have known that elephants in
zoos often suffer from poor health.Sometimes,they even become unable to have babies.
To learn more about how captivity（圈养）affects elephants, a team of international scientists compared
the life spans of female elephants born in zoos with female elephants living outdoors in their native lands.
Zoos keep detailed records of all the animals in their care,documenting factors such as birth dates,illnes-
ses,weight and death.These records made it possible for the researchers to analyze 40 years of data on 800
African and Asian elephants in zoos across Europe.The scientists compared the life spans of the zoo-born fe-
male elephants with the life spans of thousands of wild female elephants in Africa and Asian elephants that
work in logging camps（伐木场）, over approximately the same time period.
The team found that female African elephants born in zoos lived an average of 16.9 years. Their wild
counterparts who died of natural causes lived an average of 56 years一more than three times as long. Female
Asian elephants followed a similar pattern. In zoos,they lived 18.9 years,while those in the logging camps
lived 41.7 years.
Scientists don't know yet why wild elephants seem to get on so much better than their zoo-raised coun-
terparts.Georgia Mason,a biologist at the University of Guelph in Canada who led the study,thinks stress
and obesity（肥胖症）may be to blame. Zoo elephants don't get the same kind of exercise they would in the
wild,and most are very fat. Social lives of elephants are also much different in zoos than in the wild,where
they live in large herds and family groups.
The study raises some questions about acquiring more elephants to keep in zoos.While some threatened
and endangered species living in zoos reproduce（生殖）successfully and maintain healthy populations,that
doesn't appear to be the case with elephants.
It can be inferred from the last paragraph that______________.
A:zoo-born elephants should be looked after more carefully
B:zoos should keep more animals except elephants
C:it may not be wise to keep elephants in zoos
D:elephants are no longer an endangered species
White is perennially right for cruise clothes.
A:at times
B:everlastingly
C:frequently
D:occasionally
A:at times
B:everlastingly
C:frequently
D:occasionally
共用题干
The Greatest Mystery of Whales
The whale is a warm一blooded,air-breathing animal,giving birth to its young alive,sucking them一and,
like all mammals,originated on land. There are many________________(51)of this. Its front flippers（鳍状肢）,
used for steering and stability,are traces of feet.
Immense strength is________________(52)into the great body of the big whales,and in fact most of a
whale's body is one gigantic muscle.The blue whale's pulling strength has been estimated________________(53)
400 horsepower. One specimen was reported to have towed（拖）a whaling vessel for seven hours at the
_______________ (54)of eight knot（节）.
An angry whale will________________(55).A famous example of this was the fate of Whaler Essex,
________________(56)was sunk off the coast of South America early in the last century. More recently,steel ships
have ___________( 57 ) their plates buckled（使弯曲）in the same way. Sperm whales（抹香鲸）were known
to seize the old-time whaleboats in their jaws and crush them.
The greatest________________(58)of whales is their diving ability.The sperm whale dives to the bottom foi
his________________(59)food,the octopus（章鱼）.In that search he is known to go as far down as 3 , 200 feet,
where the________________(60)is 1,400 pounds,to a square inch.Doing so he will________________(61)underwa-
ter as long as one hour. Two special skills are involved in this storing up enough________________(62)(all
whales are air-breathed)and tolerating the great change in pressure.Just how he does it scientists have nol
_______________ (63).It is believed that some of the oxygen is stored in a special________________(64)of blood
vessels,rather than just held in the lungs.And it is believed that a special kind of oil in his head is some sort
of a compensating mechanism that________________(65)adjusts the internal pressure of his body.But since you
can't bring a live whale into the laboratory for study,no one knows just how these things work.
_________(58)
A:interest
B:job
C:danger
D:mystery
The Greatest Mystery of Whales
The whale is a warm一blooded,air-breathing animal,giving birth to its young alive,sucking them一and,
like all mammals,originated on land. There are many________________(51)of this. Its front flippers（鳍状肢）,
used for steering and stability,are traces of feet.
Immense strength is________________(52)into the great body of the big whales,and in fact most of a
whale's body is one gigantic muscle.The blue whale's pulling strength has been estimated________________(53)
400 horsepower. One specimen was reported to have towed（拖）a whaling vessel for seven hours at the
_______________ (54)of eight knot（节）.
An angry whale will________________(55).A famous example of this was the fate of Whaler Essex,
________________(56)was sunk off the coast of South America early in the last century. More recently,steel ships
have ___________( 57 ) their plates buckled（使弯曲）in the same way. Sperm whales（抹香鲸）were known
to seize the old-time whaleboats in their jaws and crush them.
The greatest________________(58)of whales is their diving ability.The sperm whale dives to the bottom foi
his________________(59)food,the octopus（章鱼）.In that search he is known to go as far down as 3 , 200 feet,
where the________________(60)is 1,400 pounds,to a square inch.Doing so he will________________(61)underwa-
ter as long as one hour. Two special skills are involved in this storing up enough________________(62)(all
whales are air-breathed)and tolerating the great change in pressure.Just how he does it scientists have nol
_______________ (63).It is believed that some of the oxygen is stored in a special________________(64)of blood
vessels,rather than just held in the lungs.And it is believed that a special kind of oil in his head is some sort
of a compensating mechanism that________________(65)adjusts the internal pressure of his body.But since you
can't bring a live whale into the laboratory for study,no one knows just how these things work.
_________(58)
A:interest
B:job
C:danger
D:mystery
共用题干
First Self-contained Heart Implanted
A patient on the brink of death has received the world's first self-contained artificial heart-a battery-powered device about the size of a softball that runs without the need for wires,tubes or hoses sticking out of the chest.
Two surgeons from the University of Louisville implanted the titanium and plastic pump dur-ing a seven-hour operation at Jewish Hospital Monday.The hospital said the patient was"awake and responsive"Tuesday and resting comfortably.It refused to release personal details.
The patient had been expected to die within a month without the operation,and doctors said they expected the artificial heart to extend the person's life by only a month.But the device is con-sidered a major step toward improving the patient's quality of life.
The new pump,called AbioCor,is also a technological leap from the mechanical hearts used in the 1980s,which were attached by wires and tubes to bulky machinery outside the body.The most famous of those,the Jarvic-7,used air as a pumping device and was attached to an appara-tus about the size of a washing machine.
"I think it's potentially a major step forward in the artificial heart development,"said Dr. David Faxon,president of the American Heart Association.However,he said the dream of an im-plantable,permanent artificial heart is not yet a reality,"This is obviously an experimental device whose long-term success has to be demonstrated."Only about half of the 4,200 Americans on a waiting list for donor hearts received them last year,and most of the rest died.
Some doctors,including Robert Higgins,chairman of cardiology at the Medical College of Virginia in Richmond,said artificial hearts are unlikely to replace donor hearts.
"A donor heart in a good transplant can last 15 to 30 years,"he said."It's going to be hard to replace that with a machine."
The AbilCor has a 2-pound pumping unit,and electronic controls that adjust the pumping speed based on the body's needs. It is powered by a small battery pack worn outside the body that transmits current through the skin.
There is no difference in structure between the self-contained heart and the mechanical heart.
A: Right
B: Wrong
C: Not mentioned
First Self-contained Heart Implanted
A patient on the brink of death has received the world's first self-contained artificial heart-a battery-powered device about the size of a softball that runs without the need for wires,tubes or hoses sticking out of the chest.
Two surgeons from the University of Louisville implanted the titanium and plastic pump dur-ing a seven-hour operation at Jewish Hospital Monday.The hospital said the patient was"awake and responsive"Tuesday and resting comfortably.It refused to release personal details.
The patient had been expected to die within a month without the operation,and doctors said they expected the artificial heart to extend the person's life by only a month.But the device is con-sidered a major step toward improving the patient's quality of life.
The new pump,called AbioCor,is also a technological leap from the mechanical hearts used in the 1980s,which were attached by wires and tubes to bulky machinery outside the body.The most famous of those,the Jarvic-7,used air as a pumping device and was attached to an appara-tus about the size of a washing machine.
"I think it's potentially a major step forward in the artificial heart development,"said Dr. David Faxon,president of the American Heart Association.However,he said the dream of an im-plantable,permanent artificial heart is not yet a reality,"This is obviously an experimental device whose long-term success has to be demonstrated."Only about half of the 4,200 Americans on a waiting list for donor hearts received them last year,and most of the rest died.
Some doctors,including Robert Higgins,chairman of cardiology at the Medical College of Virginia in Richmond,said artificial hearts are unlikely to replace donor hearts.
"A donor heart in a good transplant can last 15 to 30 years,"he said."It's going to be hard to replace that with a machine."
The AbilCor has a 2-pound pumping unit,and electronic controls that adjust the pumping speed based on the body's needs. It is powered by a small battery pack worn outside the body that transmits current through the skin.
There is no difference in structure between the self-contained heart and the mechanical heart.
A: Right
B: Wrong
C: Not mentioned
共用题干
More Than 8 Hours Sleep Too Much of a Good Thing
1 Although the dangers of too little sleep are widely known,new research suggests that people who sleep too much may also suffer the consequences.
2 Investigators at the University of California in San Diego found that people who clock up 9 or 10 hours each weeknight appear to have more trouble falling and staying asleep,as well as a number of other sleep problems,than people who sleep 8 hours a night. People who slept only 7 hours each night also said they had more trouble falling asleep and feeling re-freshed after a night's sleep than 8-hour sleepers.
3 These findings,which DL Daniel Kripke reported in the journal Psychosomatic Medicine,demonstrate that people who want to get a good night's rest may not need to set aside more than 8 hours a night.He added that“it might be a good idea” for people who sleep more than 8 hours each night to consider reducing the amount of time they spend in bed,but cau-tioned that more research is needed to confirm this.
4 Previous studies have shown the potential dangers of chronic shortages of sleep一for instance,one report demonstrated that people who habitually sleep less than 7 hours each night have a higher risk of dying within a fixed period than people who sleep more.
5 For the current report,Kripke reviewed the responses of 1,004 adults to sleep ques-tionaires,in which participants indicated how much they slept during the week and whether they experienced any sleep problems. Sleep problems included waking in the middle of the night,arising early in the morning and being unable to fall back to sleep,and having fatigue interfere with day-to-day functioning.
6 Kripke found that people who slept between 9 and 10 hours each night were more like-ly to report experiencing each sleep problem than people who slept 8 hours. In an interview, Kripke noted that long sleepers may struggle to get rest at night simply because they spend too much time in bed. As evidence,he added that one way to help insomnia is to spend less time in bed.“It stands to reason that if a person spends too long a time in bed,then they'll spend a higher percentage of time awake.”he said.
Paragraph 2______
A: Kripke's Research
B: Dangers of Habitual Shortages of Sleep
C: Criticism on Kripke's Report
D: A way of Overcoming Insomnia
E: Sleep Problems of Long and Short Sleepers
F: Classification of Sleep Problems
More Than 8 Hours Sleep Too Much of a Good Thing
1 Although the dangers of too little sleep are widely known,new research suggests that people who sleep too much may also suffer the consequences.
2 Investigators at the University of California in San Diego found that people who clock up 9 or 10 hours each weeknight appear to have more trouble falling and staying asleep,as well as a number of other sleep problems,than people who sleep 8 hours a night. People who slept only 7 hours each night also said they had more trouble falling asleep and feeling re-freshed after a night's sleep than 8-hour sleepers.
3 These findings,which DL Daniel Kripke reported in the journal Psychosomatic Medicine,demonstrate that people who want to get a good night's rest may not need to set aside more than 8 hours a night.He added that“it might be a good idea” for people who sleep more than 8 hours each night to consider reducing the amount of time they spend in bed,but cau-tioned that more research is needed to confirm this.
4 Previous studies have shown the potential dangers of chronic shortages of sleep一for instance,one report demonstrated that people who habitually sleep less than 7 hours each night have a higher risk of dying within a fixed period than people who sleep more.
5 For the current report,Kripke reviewed the responses of 1,004 adults to sleep ques-tionaires,in which participants indicated how much they slept during the week and whether they experienced any sleep problems. Sleep problems included waking in the middle of the night,arising early in the morning and being unable to fall back to sleep,and having fatigue interfere with day-to-day functioning.
6 Kripke found that people who slept between 9 and 10 hours each night were more like-ly to report experiencing each sleep problem than people who slept 8 hours. In an interview, Kripke noted that long sleepers may struggle to get rest at night simply because they spend too much time in bed. As evidence,he added that one way to help insomnia is to spend less time in bed.“It stands to reason that if a person spends too long a time in bed,then they'll spend a higher percentage of time awake.”he said.
Paragraph 2______
A: Kripke's Research
B: Dangers of Habitual Shortages of Sleep
C: Criticism on Kripke's Report
D: A way of Overcoming Insomnia
E: Sleep Problems of Long and Short Sleepers
F: Classification of Sleep Problems
共用题干
School Lunch
Research has shown that over half the children in Britain who take their own lunches to school do not eat_______(51)in the middle of the day.In Britain schools have to_______(52)meals at lunchtime.Children can_______(53)to bring their own food or have lunch at the school canteen.
One shocking_______(54)of this research is that school meals are much healthier than lunches prepared by parents.There are strict_______(55)for the preparation of school meals,which have to include one_______(56)of fruit and one of vegetables,as well as meat,a dairy item and starchy food like bread or pasta. Lunchboxes_______(57)by researchers contained sweet drinks, crisps and chocolate bars.Children_______(58)twice as much sugar as they should at lunchtime.
The research will provide a better_______(59)of why the percentage of overweight students in Britain has_______(60)in the last decade.Unfortunately,the government cannot_______(61)parents,but it can remind them of the_______(62)value of milk,fruit and vegetables. Small changes in their children's diet can_______(63)their future health,Children can easily develop bad eating_______(64)at this age,and parents are the only ones who can_______(65) it.
_________(58)
A:take
B:contain
C:consume
D:consist
School Lunch
Research has shown that over half the children in Britain who take their own lunches to school do not eat_______(51)in the middle of the day.In Britain schools have to_______(52)meals at lunchtime.Children can_______(53)to bring their own food or have lunch at the school canteen.
One shocking_______(54)of this research is that school meals are much healthier than lunches prepared by parents.There are strict_______(55)for the preparation of school meals,which have to include one_______(56)of fruit and one of vegetables,as well as meat,a dairy item and starchy food like bread or pasta. Lunchboxes_______(57)by researchers contained sweet drinks, crisps and chocolate bars.Children_______(58)twice as much sugar as they should at lunchtime.
The research will provide a better_______(59)of why the percentage of overweight students in Britain has_______(60)in the last decade.Unfortunately,the government cannot_______(61)parents,but it can remind them of the_______(62)value of milk,fruit and vegetables. Small changes in their children's diet can_______(63)their future health,Children can easily develop bad eating_______(64)at this age,and parents are the only ones who can_______(65) it.
_________(58)
A:take
B:contain
C:consume
D:consist
共用题干
Understanding Autism（孤独症）
1 Autism is a life-long developmental disability that prevents individuals from properly understanding
what，they see,hear,and otherwise sense.This results in severe problems of social relationships,
communication , and behavior. Individuals with autism have to painstakingly（费力地）learn normal patterns
of speech and communication,and appropriate ways to relate to people,objects,and events,in a similar
manner to those who have had a stroke.
2 The cause of autism is still unknown.Some research suggests a physical problem affecting those parts
of the brain that process language and information coming in from the senses.There may be some imbalance
of certain chemicals in the brain. Genetic（遗传的）factors may sometimes be involved. Autism may indeed
result from a combination of several"causes".
3 Most people with mental retardation（智力迟钝的）show relatively even skill development. Individuals
with autism, however,typically show uneven skill development, with deficits（欠缺）in certain areas—most
frequently in their ability to communicate and relate to others—and distinct skills in other areas.It is
importantto distinguish autism from mental retardation or other disorders , since diagnostic（诊断的）confusion
may lead to inappropriate and ineffective treatment techniques.
4 In general,individuals with autism perform best at jobs which are structured and involve a degree of
repetition.Some people who have autism are working as artists,piano tuners,painters,farm workers,office
workers,computer operators,dishwashers,assembly line workers,or employees of sheltered workshops or
other sheltered work settings.
Paragraph 2 ________
A:What Causes Autism
B:How Common is Autism
C:Does Autism Occur Together With Other Disabilities
D:What is Autism
E:What Jobs can Individuals With Autism Do
F:What is the Difference Between Autism and Mental Retardation
Understanding Autism（孤独症）
1 Autism is a life-long developmental disability that prevents individuals from properly understanding
what，they see,hear,and otherwise sense.This results in severe problems of social relationships,
communication , and behavior. Individuals with autism have to painstakingly（费力地）learn normal patterns
of speech and communication,and appropriate ways to relate to people,objects,and events,in a similar
manner to those who have had a stroke.
2 The cause of autism is still unknown.Some research suggests a physical problem affecting those parts
of the brain that process language and information coming in from the senses.There may be some imbalance
of certain chemicals in the brain. Genetic（遗传的）factors may sometimes be involved. Autism may indeed
result from a combination of several"causes".
3 Most people with mental retardation（智力迟钝的）show relatively even skill development. Individuals
with autism, however,typically show uneven skill development, with deficits（欠缺）in certain areas—most
frequently in their ability to communicate and relate to others—and distinct skills in other areas.It is
importantto distinguish autism from mental retardation or other disorders , since diagnostic（诊断的）confusion
may lead to inappropriate and ineffective treatment techniques.
4 In general,individuals with autism perform best at jobs which are structured and involve a degree of
repetition.Some people who have autism are working as artists,piano tuners,painters,farm workers,office
workers,computer operators,dishwashers,assembly line workers,or employees of sheltered workshops or
other sheltered work settings.
Paragraph 2 ________
A:What Causes Autism
B:How Common is Autism
C:Does Autism Occur Together With Other Disabilities
D:What is Autism
E:What Jobs can Individuals With Autism Do
F:What is the Difference Between Autism and Mental Retardation
共用题干
第一篇
A recent study,published in last week's Journal of American Medical Association,offers a picture of how risky it is to get a lift from a teenage driver. Indeed,a 16-year-old driver with three or more passengers is three times as likely to have a fatal accident as a teenager driving alone,by contrast,the risk of death for drivers between 30 and 59 decreases with. each additional passenger.
The author also found that the death rates for teenage drivers increased dramatically after 10 pm,and especially after midnight.With passengers in the car,the driver was even more likely to die in a late-night accident.
Robert Foss,a scientist at the University of North Carolina Highway safety Research Center, says the higher death rates for teenage drivers,have less to do with"really stupid behavior" than with just a lack of driving experience."The basic issue,"he says,"is that adults who are responsible for issuing licenses fail to recognize how complex and skilled a task driving is."
Both he and the author of the study believe that the way to mitigate（使······缓解）the problem is to have states institute so-called graduated licensing systems,in which getting a license is a multistage process.A graduated license requires that a teenager first prove himself capable of driving in the presence of an adult,followed by a period of driving with passenger restrictions,before graduating to full driving privileges.
Graduate licensing systems have reduced teenage driver crashes,according to recent studies. About half of the states now have some sort of graduated licensing system in place,but only 10 of those states have restrictions on passengers. California is the strictest,with a novice（新手）driver prohibited from carrying any passenger under 20(without the presence of an adult over 25)for the first six months.
According to Paragraph 3,which of the following statements is true?
A:Teenagers should spend more time learning to drive.
B:Driving is a skill too complicated for teenagers to learn.
C:Restriction should be imposed on teenagers applying to take driving lessons.
D:The licensing authorities are partly responsible for teenagers' driving accidents.
第一篇
A recent study,published in last week's Journal of American Medical Association,offers a picture of how risky it is to get a lift from a teenage driver. Indeed,a 16-year-old driver with three or more passengers is three times as likely to have a fatal accident as a teenager driving alone,by contrast,the risk of death for drivers between 30 and 59 decreases with. each additional passenger.
The author also found that the death rates for teenage drivers increased dramatically after 10 pm,and especially after midnight.With passengers in the car,the driver was even more likely to die in a late-night accident.
Robert Foss,a scientist at the University of North Carolina Highway safety Research Center, says the higher death rates for teenage drivers,have less to do with"really stupid behavior" than with just a lack of driving experience."The basic issue,"he says,"is that adults who are responsible for issuing licenses fail to recognize how complex and skilled a task driving is."
Both he and the author of the study believe that the way to mitigate（使······缓解）the problem is to have states institute so-called graduated licensing systems,in which getting a license is a multistage process.A graduated license requires that a teenager first prove himself capable of driving in the presence of an adult,followed by a period of driving with passenger restrictions,before graduating to full driving privileges.
Graduate licensing systems have reduced teenage driver crashes,according to recent studies. About half of the states now have some sort of graduated licensing system in place,but only 10 of those states have restrictions on passengers. California is the strictest,with a novice（新手）driver prohibited from carrying any passenger under 20(without the presence of an adult over 25)for the first six months.
According to Paragraph 3,which of the following statements is true?
A:Teenagers should spend more time learning to drive.
B:Driving is a skill too complicated for teenagers to learn.
C:Restriction should be imposed on teenagers applying to take driving lessons.
D:The licensing authorities are partly responsible for teenagers' driving accidents.
共用题干
第一篇
Is Global Warming Good for Farming?
You might think a little global warming is good for farming. Longer,warmer growing seasons
and more carbon dioxide(CO2）一what plant wouldn't love that?The agricultural industry basically agrees on that. But global warming's effects on agriculture would actually be quite complicated一and mostly not for the better.
It's true that some crops will prosper on a warmer planet,but the key word there is"some."According to a government report,higher CO2 levels and longer growing seasons will increase yields for fruit growers in the Great Lakes region.But many major American crops already use CO2 so efficiently that more of it probably won't make much difference to them.
What will make a difference are all the other things we'll have more or as temperatures rise一namely droughts（干旱）,bugs and big storms. More droughts mean lower crop yields. Melting snow in the Western US will increase water availability in spring but decrease it in summer,forcing farmers to change cropping practices.As insects that eat crops adapt their migration patterns to our warmer climate,farmers will have to either use more insecticide or plant hardier crops.
Farmers on both coasts are already starting to reap some of what the nation's fossil-fuel addiction has sown.Crops in those regions require a certain number of colder days or"winter chill"before they break dormancy（冬眠）and begin flowering. Too few cold days breaks the plants' flowering schedule which in turn affects pollination（授粉）and hurts yield.
So,given how much is at stake for them,how are farm states working to shape climate legislation?In response to agricultural demands,the Waxman-Markey bill frees the agricultural industry from CO2 emission limits and gives up control over what activities guarantee carbon offset credit to the Agricultural Department.
Some farmers一and some farm state congressional leaders一have argued that because plants convert CO2 into oxygen,agricultural lands store more CO2 than they emit. This is only theoretically true.What we can say with certainty is that,like most big industries,farming is fossil-fuel intensive一large quantities of CO2 are emitted from farm equipment such as irrigation pumps and tractors.
What is the result of"the nation's fossil-fuel addiction"on both coasts?
A:Plants yield decreases due to shortened winter chill.
B:Plants yield without dormancy and flowering.
C:Crops require longer winter chill than before.
D:The yields are no longer influenced by the climate.
第一篇
Is Global Warming Good for Farming?
You might think a little global warming is good for farming. Longer,warmer growing seasons
and more carbon dioxide(CO2）一what plant wouldn't love that?The agricultural industry basically agrees on that. But global warming's effects on agriculture would actually be quite complicated一and mostly not for the better.
It's true that some crops will prosper on a warmer planet,but the key word there is"some."According to a government report,higher CO2 levels and longer growing seasons will increase yields for fruit growers in the Great Lakes region.But many major American crops already use CO2 so efficiently that more of it probably won't make much difference to them.
What will make a difference are all the other things we'll have more or as temperatures rise一namely droughts（干旱）,bugs and big storms. More droughts mean lower crop yields. Melting snow in the Western US will increase water availability in spring but decrease it in summer,forcing farmers to change cropping practices.As insects that eat crops adapt their migration patterns to our warmer climate,farmers will have to either use more insecticide or plant hardier crops.
Farmers on both coasts are already starting to reap some of what the nation's fossil-fuel addiction has sown.Crops in those regions require a certain number of colder days or"winter chill"before they break dormancy（冬眠）and begin flowering. Too few cold days breaks the plants' flowering schedule which in turn affects pollination（授粉）and hurts yield.
So,given how much is at stake for them,how are farm states working to shape climate legislation?In response to agricultural demands,the Waxman-Markey bill frees the agricultural industry from CO2 emission limits and gives up control over what activities guarantee carbon offset credit to the Agricultural Department.
Some farmers一and some farm state congressional leaders一have argued that because plants convert CO2 into oxygen,agricultural lands store more CO2 than they emit. This is only theoretically true.What we can say with certainty is that,like most big industries,farming is fossil-fuel intensive一large quantities of CO2 are emitted from farm equipment such as irrigation pumps and tractors.
What is the result of"the nation's fossil-fuel addiction"on both coasts?
A:Plants yield decreases due to shortened winter chill.
B:Plants yield without dormancy and flowering.
C:Crops require longer winter chill than before.
D:The yields are no longer influenced by the climate.
共用题干
Swine Flu in New York
The Centers for Disease Control and Prevention(CDC)has confirmed cases of swine（猪）_______(51)
in eight students at a New York preparatory（预科的）school, Mayor Michael Bloomberg said on Sunday. The
students have had only_________(52) symptoms and none have been hospitalized,he said.Some of the
students have already recovered.
More than 100 students were absent from_______(53)due to flu-like symptoms last week.New York
health officials tested samples for eight students on Saturday and determined the students were
probably________(54)from swine flu,and the CDC confirmed the________(55)on Sunday,Bloomberg
said.
The announcement brings the ______(56) of confirmed swine flu eases in the United States to 20.
Bloomberg said there is no ________(57)of a citywide outbreak( ~K) of the flu,and no sign of a potential
outhreak of swine fiu at ___________( 58) schools.
Some students at the school_________(59) spring break in Mexico,Bloomberg gaid,bur authorities have
not determined _______( 60) any of the students with a confirmed ease of swine flu was in Mexico. Someone
who traveled to Mexico may not have had any flu symptoms but________(61) on the flu to someone else,he
noted.
Bloomberg called on students who are homesick to________(62) home for 48 hours after their
symptoms go away.
If symptoms are normal for a regular kind of
flu ， there is________(63) need to go to a hospital,said
Bloomberg. If symptoms become severe, as__________(64) any illness,people should go to the hospital,he
said.
St. Francis,which has 2,700 students,announced it will remam closed for two days.________(65)
whether the students' illnesses have been minor because they're young and healthy or because it is a minor
strain（菌株）of the virus,Bloomberg responded,"We don't know."
_________(57)
A:chance
B:sign
C:news
D:hope
Swine Flu in New York
The Centers for Disease Control and Prevention(CDC)has confirmed cases of swine（猪）_______(51)
in eight students at a New York preparatory（预科的）school, Mayor Michael Bloomberg said on Sunday. The
students have had only_________(52) symptoms and none have been hospitalized,he said.Some of the
students have already recovered.
More than 100 students were absent from_______(53)due to flu-like symptoms last week.New York
health officials tested samples for eight students on Saturday and determined the students were
probably________(54)from swine flu,and the CDC confirmed the________(55)on Sunday,Bloomberg
said.
The announcement brings the ______(56) of confirmed swine flu eases in the United States to 20.
Bloomberg said there is no ________(57)of a citywide outbreak( ~K) of the flu,and no sign of a potential
outhreak of swine fiu at ___________( 58) schools.
Some students at the school_________(59) spring break in Mexico,Bloomberg gaid,bur authorities have
not determined _______( 60) any of the students with a confirmed ease of swine flu was in Mexico. Someone
who traveled to Mexico may not have had any flu symptoms but________(61) on the flu to someone else,he
noted.
Bloomberg called on students who are homesick to________(62) home for 48 hours after their
symptoms go away.
If symptoms are normal for a regular kind of
flu ， there is________(63) need to go to a hospital,said
Bloomberg. If symptoms become severe, as__________(64) any illness,people should go to the hospital,he
said.
St. Francis,which has 2,700 students,announced it will remam closed for two days.________(65)
whether the students' illnesses have been minor because they're young and healthy or because it is a minor
strain（菌株）of the virus,Bloomberg responded,"We don't know."
_________(57)
A:chance
B:sign
C:news
D:hope
共用题干
So Many"Earths"
The Milky Way（银河）contains billions of Earth-sized planets that could support life.That's the finding of a new study.It draws on data that came from NASA's top planet-hunting telescope.
A mechanical failure recently put that Kepler space telescope out of service.Kepler had played a big role in creating a census of planets orbiting some 170,000 stars.Its data have been helping astronomers predict how common planets are in our galaxy.The telescope focused on hunting planets that might have conditions similar to those on Earth.
The authors of a study,published in The Proceedings of the National Academy of Sciences,conclude that between 14 and 30 out of every 100 stars,with a mass and temperature similar to the Sun,may host a planet that could support life as we know it.Such a planet would have a diameter at least as large as Earth's,but no more than twice that big.The planet also would have to orbit in a star's habitable zone.That's where the surface temperature would allow any water to exist as a liquid.
The new estimate of how many planets might fit these conditions comes from studying more than 42,000 stars and identifying suitable worlds orbiting them.The scientists used those numbers to extrapolate（推算） to the rest of the stars that the telescope could not see.
The estimate is rough,the authors admit.If applied to the solar system,it would define as habitable a zone starting as close to the Sun as Venus and running to as far away as Mars.Neither planet is Earthlike (although either might have been in the distant past).Using tighter limits,the researchers estimate that between 4 and 8 out of every 100 sunlike stars could host an Earth-sized world.These are ones that would take 200 to 400 days to complete a yearly orbit.
Four out of every 100 sunlike stars doesn't sound like a big number.It would mean,however,that the Milky Way could host more than a billion Earth-sized planets with a chance for life.
This is the first research finding about the planets with a chance for life.
A:Right
B:Wrong
C:Not mentioned
So Many"Earths"
The Milky Way（银河）contains billions of Earth-sized planets that could support life.That's the finding of a new study.It draws on data that came from NASA's top planet-hunting telescope.
A mechanical failure recently put that Kepler space telescope out of service.Kepler had played a big role in creating a census of planets orbiting some 170,000 stars.Its data have been helping astronomers predict how common planets are in our galaxy.The telescope focused on hunting planets that might have conditions similar to those on Earth.
The authors of a study,published in The Proceedings of the National Academy of Sciences,conclude that between 14 and 30 out of every 100 stars,with a mass and temperature similar to the Sun,may host a planet that could support life as we know it.Such a planet would have a diameter at least as large as Earth's,but no more than twice that big.The planet also would have to orbit in a star's habitable zone.That's where the surface temperature would allow any water to exist as a liquid.
The new estimate of how many planets might fit these conditions comes from studying more than 42,000 stars and identifying suitable worlds orbiting them.The scientists used those numbers to extrapolate（推算） to the rest of the stars that the telescope could not see.
The estimate is rough,the authors admit.If applied to the solar system,it would define as habitable a zone starting as close to the Sun as Venus and running to as far away as Mars.Neither planet is Earthlike (although either might have been in the distant past).Using tighter limits,the researchers estimate that between 4 and 8 out of every 100 sunlike stars could host an Earth-sized world.These are ones that would take 200 to 400 days to complete a yearly orbit.
Four out of every 100 sunlike stars doesn't sound like a big number.It would mean,however,that the Milky Way could host more than a billion Earth-sized planets with a chance for life.
This is the first research finding about the planets with a chance for life.
A:Right
B:Wrong
C:Not mentioned
共用题干
Better Control of TB Seen If a Faster Cure Is Found
The World Health Organization estimates that about one-third of all people are infected with bacteria that cause tuberculosis（结核病）.Most times , the infection remains inactive（不活跃
的）.But each year about eight million people develop active cases of TB,usually in their lungs. Two million people die of it.The disease has increased with the spread of AIDS and drug-resist-ant forms of tuberculosis.
Current treatments take at least six months.Patients have to take a combination of several antibiotic（抗生素）drugs daily. But many people stop as soon as they feel better. Doing that can lead to an infection（传染病）that resists treatment. Public health experts agree that a faster-act-ing cure for tuberculosis would be more effective.Now a study estimates just how effective it might be .A professor of international health at Harvard University led the study.Joshua Salomon says a shorter treatment program would likely mean not just more patients cured.It would also mean fe- wer infectious patients who can pass on their infection to others.
The researchers developed a mathematical（数学的）model to examine the effects of a two-month treatment plan.They tested the model with current TB conditions in Southeast Asia.The scientists found that a two-month treatment could prevent about twenty percent of new cases.And it might prevent about twenty-five percent of TB deaths.The model shows that these reductions would take place between two thousand twelve and two thousand thirty.That is,if a faster cure is developed and in wide use by two thousand twelve.
The World Health Organization developed the DOTS program in nineteen ninety.DOTS（短期直接观察治疗）is Directly Observed Treatment, Short-course. Health workers watch tubercu- losis patients take their daily pills to make sure they continue treatment.
Earlier this year,an international partnership of organizations announced a plan to expand the DOTS program.The ten-year plan also aims to finance research into new TB drugs.The four most common drugs used now are more than forty years old.The Global Alliance for TB Drug De- velopment（全球结核病药物开发联盟）says its long-term goal is a treatment that could work in as few as ten doses.
The long-term goal of the Global Alliance for TB Drug Development is a treatment that could work______.
A: in half a year
B: in two months
C: in ten doses
D:in ten days
Better Control of TB Seen If a Faster Cure Is Found
The World Health Organization estimates that about one-third of all people are infected with bacteria that cause tuberculosis（结核病）.Most times , the infection remains inactive（不活跃
的）.But each year about eight million people develop active cases of TB,usually in their lungs. Two million people die of it.The disease has increased with the spread of AIDS and drug-resist-ant forms of tuberculosis.
Current treatments take at least six months.Patients have to take a combination of several antibiotic（抗生素）drugs daily. But many people stop as soon as they feel better. Doing that can lead to an infection（传染病）that resists treatment. Public health experts agree that a faster-act-ing cure for tuberculosis would be more effective.Now a study estimates just how effective it might be .A professor of international health at Harvard University led the study.Joshua Salomon says a shorter treatment program would likely mean not just more patients cured.It would also mean fe- wer infectious patients who can pass on their infection to others.
The researchers developed a mathematical（数学的）model to examine the effects of a two-month treatment plan.They tested the model with current TB conditions in Southeast Asia.The scientists found that a two-month treatment could prevent about twenty percent of new cases.And it might prevent about twenty-five percent of TB deaths.The model shows that these reductions would take place between two thousand twelve and two thousand thirty.That is,if a faster cure is developed and in wide use by two thousand twelve.
The World Health Organization developed the DOTS program in nineteen ninety.DOTS（短期直接观察治疗）is Directly Observed Treatment, Short-course. Health workers watch tubercu- losis patients take their daily pills to make sure they continue treatment.
Earlier this year,an international partnership of organizations announced a plan to expand the DOTS program.The ten-year plan also aims to finance research into new TB drugs.The four most common drugs used now are more than forty years old.The Global Alliance for TB Drug De- velopment（全球结核病药物开发联盟）says its long-term goal is a treatment that could work in as few as ten doses.
The long-term goal of the Global Alliance for TB Drug Development is a treatment that could work______.
A: in half a year
B: in two months
C: in ten doses
D:in ten days
共用题干
第一篇
Genetic Engineering
Genetic engineering began when the DNA molecule（分子）,the most basic unit of life , was first
described in 1953 by James Watson and Francis Crick.An understanding of DNA led to the altering of
normal cell reproduction.Experiments with altering human cells began in 1970.In one of the first
experiments,patients were injected with a virus that would produce a life-saving enzyme,but their bodies
would not accept it.In 1980 patients with a rare but fatal blood disease were injected with a purified gene
that was cloned through DNA technology.Another failure.
Genetic engineering got a legal boost（激励）in 1980. The U. S. Supreme Court said that a patent could
be granted on a genetically engineered "oil-eating" bacterium（细菌）.This bacterium would help clean up
oil spills.The ruling encouraged companies to invent new life forms,and three important medical products
were quickly developed.
1.Human interferon（干扰素）—a possible solution to some cancers and viral diseases.A newly engineered
bacterium produced human interferon as a by-product. This new product reduced the cost of interferon.
2. Human growth hormone（荷尔蒙）一for children whose bodies do not grow to normal height. An
expensive growth hormone was previously produced from human cadavers,but by changing the genetic make-
up of the single-cell bacterium E.coli,and affordable growth hormone could be produced.
3. Human insulin（胰岛素）一for the treatment of diabetes. People with diabetes used to rely on a beef-
or-pork-based product until 1982.Now insulin can be manufactured by genetically altered bacteria.
Advances in genetic engineering have continued,though they constantly must be weighed against the
safety of procedures.There is clearly much more to discover.
This passage is mainly about_________.
A:the effects of altering cells
B:the human growth hormone
C:insulin resistance
D:U.S.Supreme Court rulings
第一篇
Genetic Engineering
Genetic engineering began when the DNA molecule（分子）,the most basic unit of life , was first
described in 1953 by James Watson and Francis Crick.An understanding of DNA led to the altering of
normal cell reproduction.Experiments with altering human cells began in 1970.In one of the first
experiments,patients were injected with a virus that would produce a life-saving enzyme,but their bodies
would not accept it.In 1980 patients with a rare but fatal blood disease were injected with a purified gene
that was cloned through DNA technology.Another failure.
Genetic engineering got a legal boost（激励）in 1980. The U. S. Supreme Court said that a patent could
be granted on a genetically engineered "oil-eating" bacterium（细菌）.This bacterium would help clean up
oil spills.The ruling encouraged companies to invent new life forms,and three important medical products
were quickly developed.
1.Human interferon（干扰素）—a possible solution to some cancers and viral diseases.A newly engineered
bacterium produced human interferon as a by-product. This new product reduced the cost of interferon.
2. Human growth hormone（荷尔蒙）一for children whose bodies do not grow to normal height. An
expensive growth hormone was previously produced from human cadavers,but by changing the genetic make-
up of the single-cell bacterium E.coli,and affordable growth hormone could be produced.
3. Human insulin（胰岛素）一for the treatment of diabetes. People with diabetes used to rely on a beef-
or-pork-based product until 1982.Now insulin can be manufactured by genetically altered bacteria.
Advances in genetic engineering have continued,though they constantly must be weighed against the
safety of procedures.There is clearly much more to discover.
This passage is mainly about_________.
A:the effects of altering cells
B:the human growth hormone
C:insulin resistance
D:U.S.Supreme Court rulings
共用题干
American Families
1 Despite social and economic differences among Americans,many American families have certain characteristics in common.Both the husband and wife were born in the United States,and their forefathers came from Europe.They have completed high school,and they belong to the middle class.They have a car, a television set,a washing machine,a refrigerator,a telephone,etc.They own their own home and spend about 55%of their income for housing and food.Clothing accounts for almost 10%of their income,medical care 6%,transportation 8%and taxes 15%.The rest of their income is used for such items as insurance, savings,gifts,and recreation.
2 Most families consist of a mother,a father,and,at most,two children living at home.There may be relatives-grandparents,aunts,uncles,cousins living in the same community,but American families usually maintain separate households.This family structure is known as the"nuclear family".It is unusual. for members of the family other than the husband,wife,and children to live together.
3 Marriage in the United States is considered a matte,r of individual responsibility and decision.Young people frequently fall in love and many even if their parents disagree.American marriages are usually based on romantic love,rather than on social class,education,or religion.
4 After their marriage the young couple is free to decide where to live and when to start a family.Most young couples set up their own household immediately.In the early 1970s only 15%of all married couples were not living on their own-independently and by themselves.Most married people practise some kind of birth control.They plan the number of children they are going to have and when their children will be born. The practice of limiting the size of families has general approval.The birth rate has been declining steadily in recent years.
Young Americans make on marriage______.
A:live with their parents
B:their own decisions
C:most American families are usually small
D:the family structure
E:some similar features
F:has been dropping
American Families
1 Despite social and economic differences among Americans,many American families have certain characteristics in common.Both the husband and wife were born in the United States,and their forefathers came from Europe.They have completed high school,and they belong to the middle class.They have a car, a television set,a washing machine,a refrigerator,a telephone,etc.They own their own home and spend about 55%of their income for housing and food.Clothing accounts for almost 10%of their income,medical care 6%,transportation 8%and taxes 15%.The rest of their income is used for such items as insurance, savings,gifts,and recreation.
2 Most families consist of a mother,a father,and,at most,two children living at home.There may be relatives-grandparents,aunts,uncles,cousins living in the same community,but American families usually maintain separate households.This family structure is known as the"nuclear family".It is unusual. for members of the family other than the husband,wife,and children to live together.
3 Marriage in the United States is considered a matte,r of individual responsibility and decision.Young people frequently fall in love and many even if their parents disagree.American marriages are usually based on romantic love,rather than on social class,education,or religion.
4 After their marriage the young couple is free to decide where to live and when to start a family.Most young couples set up their own household immediately.In the early 1970s only 15%of all married couples were not living on their own-independently and by themselves.Most married people practise some kind of birth control.They plan the number of children they are going to have and when their children will be born. The practice of limiting the size of families has general approval.The birth rate has been declining steadily in recent years.
Young Americans make on marriage______.
A:live with their parents
B:their own decisions
C:most American families are usually small
D:the family structure
E:some similar features
F:has been dropping
He is a physician.
A:researcher
B:professor
C:doctor
D:student
A:researcher
B:professor
C:doctor
D:student