单选题Thirty years ago, most teenagers had bicycles, but now they are comparatively rare.____56___,motor scooters (小型摩托车) are much more common.____57___, this may seem to be a sign of progress but____58___the change is not necessarily for the better. It is easy to see why young people prefer scooters.____59___, they are much faster and do not require much physical effort,____60___, you can take a passenger with you on the pillion（后座）seat behind;____61___,they give young people a feeling of independence, because they can travel further and impress their friends.____62___, the disadvantages are equally obvious.____63___first sight, scooters are more expensive to buy and to maintain, and____64___those under 16 are not allowed to have them.____65___, greater freedom brings danger because speed encourages young people to take risks and as a result scooters are involved____66___more accidents, and the accidents are____67___more serious. Bicycles are safer and easier to control.Years ago, teenagers had more experience with them because they____68___to ride as young children, and consequently knew what they were capable of.____69___, many young people overestimate what a scooter can do and pretend it has the power of a motorcycle.____70___, the fact is that bicycles are not very safe____71___.in cities these days because there are more cars and drivers are not used to them and do not make allowances for them. ____72___, those who are old enough to ride scooters naturally prefer them. Those who are too young or cannot afford to buy a scooter probably 6nd bicycles slow and uncomfortable____73___,and riding bicycles requires____74___experience of traffic than before. On balance, the change has been for the worse,____75___for the 13-and 14-year-olds, but the only safe solution would be to have special lanes（车道） for cyclists. 74 A.much B. a lot of C.rich D.moreAmuchBa lot ofCrichDmore
单选题
Thirty years ago, most teenagers had bicycles, but now they are comparatively rare.____56___,motor scooters (小型摩托车) are much more common.____57___, this may seem to be a sign of progress but____58___the change is not necessarily for the better. It is easy to see why young people prefer scooters.____59___, they are much faster and do not require much physical effort,____60___, you can take a passenger with you on the pillion（后座）seat behind;____61___,they give young people a feeling of independence, because they can travel further and impress their friends.____62___, the disadvantages are equally obvious.____63___first sight, scooters are more expensive to buy and to maintain, and____64___those under 16 are not allowed to have them.____65___, greater freedom brings danger because speed encourages young people to take risks and as a result scooters are involved____66___more accidents, and the accidents are____67___more serious. Bicycles are safer and easier to control.Years ago, teenagers had more experience with them because they____68___to ride as young children, and consequently knew what they were capable of.____69___, many young people overestimate what a scooter can do and pretend it has the power of a motorcycle.____70___, the fact is that bicycles are not very safe____71___.in cities these days because there are more cars and drivers are not used to them and do not make allowances for them. ____72___, those who are old enough to ride scooters naturally prefer them. Those who are too young or cannot afford to buy a scooter probably 6nd bicycles slow and uncomfortable____73___,and riding bicycles requires____74___experience of traffic than before. On balance, the change has been for the worse,____75___for the 13-and 14-year-olds, but the only safe solution would be to have special lanes（车道） for cyclists. 74 A.much B. a lot of C.rich D.more
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much
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a lot of
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rich
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more
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I started my teaching career at the school. That was more than twenty years ago, and I _____ there ever since.A. wasB. had beenC. will beD. have been
The world’s population continues to grow. There now are about 4 billion of us on earth. That could reach 6 billion by the end of the century and 11 billion in a further 75 years. Experts have long been concerned about such a growth. Where will we find the food, water, jobs, houses, school and health care for all these people?A major new study shows that the situation may be changing. A large and rapid drop in the world’s birth rate has taken place during the past 10 years. Families generally are smaller now than they were a few years ago. It is happening in both developing and industrial nations.Researchers said they found a number of reasons for this. More men and women are waiting longer to get married and are using birth control devices and methods to prevent or delay pregnancy. More women are going to school or working at jobs away from home instead of having children. And more governments, especially in developing nations, now support family planning programs to reduce population grow.China is one of the nations that have made great progress in reducing its population growth. China has already cut its rate of population growth by about half since 1970.Each Chinese family is now urged to have no more than one child. And the hope is to reach a zero population growth with the total number of births equaling the total number of deaths by the year 2000.Several nations in Europe already have fewer births than deaths. Experts said that these nations could face a serious shortage of workers in the future. And the persons who are working could face much higher taxes to help support the growing number of retired people.1. The world’s population could reach ____________.A. 6 billion in 75 yearsB. 11 billion in 2075C. 11 billion by the end of this centuryD. 600 million in 15 years2. Which of the following is true?A. The world’s birth rate is higher than ten years ago.B. There has been a slower population growth in the past ten years.C. Families are as large as before.D. Birth control has been well practiced in all nations.3. By the year 2000, the number of births and the number of deaths in China will _______.A. be greatly differentB. drop a great dealC. be equalD. become much larger4. According to the essay, China’s population control ________.A. is not quite successfulB. should be considered a big successC. is far from being successfulD. is a complete failure5. It may happen in the future that the people who are working in Europe will have to pay much higher taxes because___________.A. more and more children will be bornB. the number of retired people will become ever largerC. fewer and fewer children will be bornD. they will be making a lot of money
Compared with parents of 30 years ago, today's parents ( )．A． go to clubs more often with their childrenB． are much stricter with their childrenC． care less about．their children's lifeD． give their children more freedom
It can be inferred from the text that most unhappily married adults __（ ）[A] should divorce in no more than 5 years[B] prefer to stay together for another 5 years[C] feel happy after staying together for another 5 years[D] become much happier after divorce
Although there are disagreements over the definition of revolution,there is a standard view that revolutions are successful social movements on a much grander（ ）.That is,involving more people and much more social change.Although social movement like the U.S.Civil RightsMovement may be working to enact some law or produce some reform in the society,revolutions like the Chinese Revolution are aimed at major social change.A.levelB.scaleC.degreeD.range
Compared with parents of 30 years ago，today’s parents__________．A.go to clubs more often with their childrenB.are much stricter with their childrenC.care less about their children’s lifeD.give their children more freedom
Do friends of the opposite gender distract teenagers,hampering their academic performance?It may seem obvious,and yet it is hard to prove.A survey of American schoolchildren conducted in 1995,for example,suggests no link between the proportion of a girl's friends who were boys and her grades.A new paper by Andrew Hill of the University of South Carolina,however,comes to a different result.He finds that for every 10%more children of the opposite sex among a student's friends,his or her grade-point average（GPA）declines by O.l（GPAs range from O t0 4）.Not only may having more friends of the opposite sex be bad for grades,but it has other effects,too.Among the children from the original survey who were successfully re-interviewed 14 years later,those whose grades had been dragged down by friends of the opposite gender were more likely to be married.
Text 2 Whatever happened to the death of newspaper?A year ago the end seemed near.The recession threatened to remove the advertising and readers that had not already fled to the Internet.Newspapers like the San Francisco Chronicle were chronicling their own doom.America's Federal Trade Commission launched a round of talks about how to save newspapers.Should they become charitable corporations?Should the state subsidize them?It will hold another meeting soon.But the discussions now seem out of date.In much of the world there is little sign of crisis.German and Brazilian papers have shrugged off the recession.Even American newspapers,which inhabit the most troubled corner of the global industry,have not only survived but often returned to profit.Not the 20%profit margins that were routine a few years ago,but profit all the same.It has not been much fun.Many papers stayed afloat by pushing journalists overboard.The American Society of News Editors reckons that 13,500 newsroom jobs have gone since 2007.Readers are paying more for slimmer products.Some papers even had the nerve to refuse delivery to distant suburbs.Yet these desperate measures have proved the right ones and,sadly for many journalists,they can be pushed further.Newspapers are becoming more balanced businesses,with a healthier mix of revenues from readers and advertisers.American papers have long been highly unusual in their reliance on ads.Fully 87%of their revenues came from advertising in 2008,according to the Organization for Economic Cooperation&Development（OECD）.In Japan the proportion is 35%.Not surprisingly,Japanese newspapers are much more stable.The whirlwind that swept through newsrooms harmed everybody,but much of the damage has been concentrated in areas where newspapers are least distinctive.Car and film reviewers have gone.So have science and general business reporters.Foreign bureaus have been savagely cut off.Newspapers are less complete as a result.But completeness is no longer a virtue in the newspaper business.Compared with their American counterparts,Japanese newspapers are much more stable because they______A.have more sources of revenueB.have more balanced newsroomsC.are less dependent on advertisingD.are less affected by readership
Text 2 Whatever happened to the death of newspaper?A year ago the end seemed near.The recession threatened to remove the advertising and readers that had not already fled to the Internet.Newspapers like the San Francisco Chronicle were chronicling their own doom.America's Federal Trade Commission launched a round of talks about how to save newspapers.Should they become charitable corporations?Should the state subsidize them?It will hold another meeting soon.But the discussions now seem out of date.In much of the world there is little sign of crisis.German and Brazilian papers have shrugged off the recession.Even American newspapers,which inhabit the most troubled corner of the global industry,have not only survived but often returned to profit.Not the 20%profit margins that were routine a few years ago,but profit all the same.It has not been much fun.Many papers stayed afloat by pushing journalists overboard.The American Society of News Editors reckons that 13,500 newsroom jobs have gone since 2007.Readers are paying more for slimmer products.Some papers even had the nerve to refuse delivery to distant suburbs.Yet these desperate measures have proved the right ones and,sadly for many journalists,they can be pushed further.Newspapers are becoming more balanced businesses,with a healthier mix of revenues from readers and advertisers.American papers have long been highly unusual in their reliance on ads.Fully 87%of their revenues came from advertising in 2008,according to the Organization for Economic Cooperation&Development（OECD）.In Japan the proportion is 35%.Not surprisingly,Japanese newspapers are much more stable.The whirlwind that swept through newsrooms harmed everybody,but much of the damage has been concentrated in areas where newspapers are least distinctive.Car and film reviewers have gone.So have science and general business reporters.Foreign bureaus have been savagely cut off.Newspapers are less complete as a result.But completeness is no longer a virtue in the newspaper business.By saying“Newspapers like…their own doom”（Lines 23,Para.1）,the author indicates that newspapers____A.neglected the sign of crisisB.failed to get state subsidiesC.were not charitable corporationsD.were in a desperate situation
Text 2 Whatever happened to the death of newspaper?A year ago the end seemed near.The recession threatened to remove the advertising and readers that had not already fled to the Internet.Newspapers like the San Francisco Chronicle were chronicling their own doom.America's Federal Trade Commission launched a round of talks about how to save newspapers.Should they become charitable corporations?Should the state subsidize them?It will hold another meeting soon.But the discussions now seem out of date.In much of the world there is little sign of crisis.German and Brazilian papers have shrugged off the recession.Even American newspapers,which inhabit the most troubled corner of the global industry,have not only survived but often returned to profit.Not the 20%profit margins that were routine a few years ago,but profit all the same.It has not been much fun.Many papers stayed afloat by pushing journalists overboard.The American Society of News Editors reckons that 13,500 newsroom jobs have gone since 2007.Readers are paying more for slimmer products.Some papers even had the nerve to refuse delivery to distant suburbs.Yet these desperate measures have proved the right ones and,sadly for many journalists,they can be pushed further.Newspapers are becoming more balanced businesses,with a healthier mix of revenues from readers and advertisers.American papers have long been highly unusual in their reliance on ads.Fully 87%of their revenues came from advertising in 2008,according to the Organization for Economic Cooperation&Development（OECD）.In Japan the proportion is 35%.Not surprisingly,Japanese newspapers are much more stable.The whirlwind that swept through newsrooms harmed everybody,but much of the damage has been concentrated in areas where newspapers are least distinctive.Car and film reviewers have gone.So have science and general business reporters.Foreign bureaus have been savagely cut off.Newspapers are less complete as a result.But completeness is no longer a virtue in the newspaper business.The most appropriate title for this text would be____A.American Newspapers:Struggling for SurvivalB.American Newspapers:Gone with the WindC.American Newspapers:A Thriving BusinessD.American Newspapers:A Hopeless Story
共用题干Older Volcanic EruptionsVolcanoes were more destructive in ancient history,not because they were bigger,but because the carbon dioxide they released wiped out life with greater ease.Paul Wignall from the University of Leeds was investigating the link between volcanic eruptions and mass extinctions.Not all volcanic eruptions killed off large numbers of animals,but all the mass extinctions over the past 300 million years coincided with huge formations of volcanic rock.To his surprise,the older the massive volcanic eruptions were,the more damage they seemed to do.He calculated the"killing efficiency" for these volcanoes by comparing the proportion of life they killed off with the volume of lava（熔岩）that they produced.He found that size for size,older eruptions were at least 10 times as effective at wiping out life as their more recent rivals.The Permian（二叠纪）extinction,for example,which happened 250 million years ago,is marked by floods of volcanic rock in Siberia that cover an area roughly the size of western Europe.Those volcanoes are thought to have pumped out about 10 gigatonnes of carbon as carbon dioxide.The global warming that followed wiped out 80 percent of all marine genera（种类）at the time,and it took 5 million years for the planet to recover.Yet 60 million years ago,there was another huge amount of volcanic activity and global warming but no mass extinction.Some animals did disappear but things returned to normal within ten thousand of years."The most recent ones hardlyhave an effect at all,"Wignall says.He ignored the extinction which wiped out the dinosaurs 65 million years ago,because many scientists believe it was primarily caused by the impact of an asteroid（小行星）.He thinks that older volcanoes had more killing power because more recent life forms were better adapted to dealing with increased levels of CO2．Vincent Courtill.ot,director of the Paris Geophysical Institute in France,says that Wignall's idea is provocative.But he says it is incredibly hard to do these sorts of calculations.He points out that the killing power of volcanic eruptions depends on how long they lasted.And it is impossible to tell whether the huge blasts lasted for tliousands or millions of years.He also adds that it is difficult to estimate how much lava prehistoric volcanoes produced,and that lava volume may not necessarily correspond to carbon dioxide emissions。What can be inferred from Paragraph 3 concerning dinosaurs?A:They were killed off by an asteroid.B:They died of drastic climate change.C:They were wiped off by a volcanic eruption.D:The cause of their extinction has remained a controversial issue.
共用题干Older Volcanic EruptionsVolcanoes were more destructive in ancient history,not because they were bigger,but because the carbon dioxide they released wiped out life with greater ease.Paul Wignall from the University of Leeds was investigating the link between volcanic eruptions and mass extinctions.Not all volcanic eruptions killed off large numbers of animals,but all the mass extinctions over the past 300 million years coincided with huge formations of volcanic rock.To his surprise,the older the massive volcanic eruptions were,the more damage they seemed to do.He calculated the"killing efficiency" for these volcanoes by comparing the proportion of life they killed off with the volume of lava（熔岩）that they produced.He found that size for size,older eruptions were at least 10 times as effective at wiping out life as their more recent rivals.The Permian（二叠纪）extinction,for example,which happened 250 million years ago,is marked by floods of volcanic rock in Siberia that cover an area roughly the size of western Europe.Those volcanoes are thought to have pumped out about 10 gigatonnes of carbon as carbon dioxide.The global warming that followed wiped out 80 percent of all marine genera（种类）at the time,and it took 5 million years for the planet to recover.Yet 60 million years ago,there was another huge amount of volcanic activity and global warming but no mass extinction.Some animals did disappear but things returned to normal within ten thousand of years."The most recent ones hardlyhave an effect at all,"Wignall says.He ignored the extinction which wiped out the dinosaurs 65 million years ago,because many scientists believe it was primarily caused by the impact of an asteroid（小行星）.He thinks that older volcanoes had more killing power because more recent life forms were better adapted to dealing with increased levels of CO2．Vincent Courtill.ot,director of the Paris Geophysical Institute in France,says that Wignall's idea is provocative.But he says it is incredibly hard to do these sorts of calculations.He points out that the killing power of volcanic eruptions depends on how long they lasted.And it is impossible to tell whether the huge blasts lasted for tliousands or millions of years.He also adds that it is difficult to estimate how much lava prehistoric volcanoes produced,and that lava volume may not necessarily correspond to carbon dioxide emissions。When did dinosaurs become extinct?A:300 million years ago.B:250 milliOn years ago.C:60 million years ago.D:65 million years ago.
共用题干1.All research to date on body image shows that women are much more critical of their appearance than men and much less likely to admire what they see in the mirror. Up to 8 out of 10 women are dissatisfied with their reflection,and more than half may see a distorted image.2.Men looking in the mirror are more likely to be either pleased with what they see or indifferent. Research shows that men generally have a much more positive body-image than women一if anything,they may tend to over-estimate their attractiveness.Some men looking in the mirror may literally not see the flaws in their appearance.3.Why are women too much more self-critical than men?Because women are judged on their appearance more than men,and standards of female beauty are considerably higher and more inflexible.Women are continually bombarded with images of the inflexible.Women are continually bombarded with images of the"ideal"face.And constant exposure to idealized images of female beauty on TV,magazines and billboards makes exceptional good looks seem normal and anything short of perfection seem abnormal and ugly.It has been estimated that young women now see more images of outstandingly beautiful women in one day than our mothers saw throughout their entire adolescence.4.Also,most women are trying to achieve the impossible:standards of female beauty have in fact become progressively more unrealistic during the last century.In 1917,the physically perfect woman was about 5 feet 4 inches tall and weighed nearly 10 stone（约140磅）.Even 25 years ago, top models and beauty queens weighed only 8% less than the average woman,now they weigh 23% less.The current media ideal for women is achievable by less than 5% of the female population一and that's just in terms of weight and size.If you want the ideal shape,face,etc, it's probably more like 1%.Paragraph 4_________A:How do men view their appearance?B:How can women make themselves more beautiful?C:Why do men and women view their appearance differently?D:Is it possible for women to meet the standards of perfect beauty?E:How do people judge women and men? F: How do women view their appearance?
共用题干1.All research to date on body image shows that women are much more critical of their appearance than men and much less likely to admire what they see in the mirror. Up to 8 out of 10 women are dissatisfied with their reflection,and more than half may see a distorted image.2.Men looking in the mirror are more likely to be either pleased with what they see or indifferent. Research shows that men generally have a much more positive body-image than women一if anything,they may tend to over-estimate their attractiveness.Some men looking in the mirror may literally not see the flaws in their appearance.3.Why are women too much more self-critical than men?Because women are judged on their appearance more than men,and standards of female beauty are considerably higher and more inflexible.Women are continually bombarded with images of the inflexible.Women are continually bombarded with images of the"ideal"face.And constant exposure to idealized images of female beauty on TV,magazines and billboards makes exceptional good looks seem normal and anything short of perfection seem abnormal and ugly.It has been estimated that young women now see more images of outstandingly beautiful women in one day than our mothers saw throughout their entire adolescence.4.Also,most women are trying to achieve the impossible:standards of female beauty have in fact become progressively more unrealistic during the last century.In 1917,the physically perfect woman was about 5 feet 4 inches tall and weighed nearly 10 stone（约140磅）.Even 25 years ago, top models and beauty queens weighed only 8% less than the average woman,now they weigh 23% less.The current media ideal for women is achievable by less than 5% of the female population一and that's just in terms of weight and size.If you want the ideal shape,face,etc, it's probably more like 1%.Today the percentage of women who have the ideal shape,face,etc is probably like________.A:literally not see the flaws in their appearance.B:1%C:smile at themselvesD:standards of female beauty are considerably higher and more inflexibleE:progressively more unrealisticF:5%
共用题干1.All research to date on body image shows that women are much more critical of their appearance than men and much less likely to admire what they see in the mirror. Up to 8 out of 10 women are dissatisfied with their reflection,and more than half may see a distorted image.2.Men looking in the mirror are more likely to be either pleased with what they see or indifferent. Research shows that men generally have a much more positive body-image than women一if anything,they may tend to over-estimate their attractiveness.Some men looking in the mirror may literally not see the flaws in their appearance.3.Why are women too much more self-critical than men?Because women are judged on their appearance more than men,and standards of female beauty are considerably higher and more inflexible.Women are continually bombarded with images of the inflexible.Women are continually bombarded with images of the"ideal"face.And constant exposure to idealized images of female beauty on TV,magazines and billboards makes exceptional good looks seem normal and anything short of perfection seem abnormal and ugly.It has been estimated that young women now see more images of outstandingly beautiful women in one day than our mothers saw throughout their entire adolescence.4.Also,most women are trying to achieve the impossible:standards of female beauty have in fact become progressively more unrealistic during the last century.In 1917,the physically perfect woman was about 5 feet 4 inches tall and weighed nearly 10 stone（约140磅）.Even 25 years ago, top models and beauty queens weighed only 8% less than the average woman,now they weigh 23% less.The current media ideal for women is achievable by less than 5% of the female population一and that's just in terms of weight and size.If you want the ideal shape,face,etc, it's probably more like 1%.Women are more self-critical than men because women are judged on their appearance mor than men,and_____.A:literally not see the flaws in their appearance.B:1%C:smile at themselvesD:standards of female beauty are considerably higher and more inflexibleE:progressively more unrealisticF:5%
共用题干1.All research to date on body image shows that women are much more critical of their appearance than men and much less likely to admire what they see in the mirror. Up to 8 out of 10 women are dissatisfied with their reflection,and more than half may see a distorted image.2.Men looking in the mirror are more likely to be either pleased with what they see or indifferent. Research shows that men generally have a much more positive body-image than women一if anything,they may tend to over-estimate their attractiveness.Some men looking in the mirror may literally not see the flaws in their appearance.3.Why are women too much more self-critical than men?Because women are judged on their appearance more than men,and standards of female beauty are considerably higher and more inflexible.Women are continually bombarded with images of the inflexible.Women are continually bombarded with images of the"ideal"face.And constant exposure to idealized images of female beauty on TV,magazines and billboards makes exceptional good looks seem normal and anything short of perfection seem abnormal and ugly.It has been estimated that young women now see more images of outstandingly beautiful women in one day than our mothers saw throughout their entire adolescence.4.Also,most women are trying to achieve the impossible:standards of female beauty have in fact become progressively more unrealistic during the last century.In 1917,the physically perfect woman was about 5 feet 4 inches tall and weighed nearly 10 stone（约140磅）.Even 25 years ago, top models and beauty queens weighed only 8% less than the average woman,now they weigh 23% less.The current media ideal for women is achievable by less than 5% of the female population一and that's just in terms of weight and size.If you want the ideal shape,face,etc, it's probably more like 1%.Men generally have such a positive body-image that some men looking in the mirn may_______.A:literally not see the flaws in their appearance.B:1%C:smile at themselvesD:standards of female beauty are considerably higher and more inflexibleE:progressively more unrealisticF:5%
共用题干Older Volcanic EruptionsVolcanoes were more destructive in ancient history,not because they were bigger,but because the carbon dioxide they released wiped out life with greater ease.Paul Wignall from the University of Leeds was investigating the link between volcanic eruptions and mass extinctions.Not all volcanic eruptions killed off large numbers of animals,but all the mass extinctions over the past 300 million years coincided with huge formations of volcanic rock.To his surprise,the older the massive volcanic eruptions were,the more damage they seemed to do.He calculated the"killing efficiency"for these volcanoes by comparing the proportion of life they killed off with the volume of lava（熔 岩）that they produced.He found that size for size,older eruptions were at least 10 times as effective at wiping out life as their more recent rivals.The Peimian（二叠纪）extinction,for example,which happened 250 million years ago,is marked by floods of volcanic rock in Siberia that cover an area roughly the size of western Europe.Those volcanoes are thought to have pumped out about 10 gigatonnes（十亿吨）of carbon as carbon dioxide.The global warming that followed wiped out 80 prcent of all marine genera（种类）at the time , and it took 5 million years for the planet to recover.Yet 60 million years ago,there was another huge amount of volcanic activity and global warming but no mass extinction.Some animals did disappear but things returned to normal within ten thousands of years."The most recent ones hardly have an effect at all."Wignall says.He ignored the extinction which wiped out the dinosaurs 65 million years ago,because many scientists believe it was primarily caused by the impact of an asteroid（小行星）.He thinks that older volcanoes had more killing power because more recent life forms were better adapted to dealing with increased levels of CO2.Vincent Courtillot,director of the Paris Geophysical Institute in France,says that Wignall's idea is provocative.But he says it is incredibly hard to do these sorts of calculations.He points out that the killing power of volcanic eruptions depends on how long they lasted.And it is impossible to tell whether the huge blasts lasted for thousands or millions of years.He also adds that it is difficult to estimate how much lava prehistoric volcanoes produced,and that lava volume may not necessarily correspond to carbon dioxide emissions.Permian extinction occurred ______.A:300 million years ago B:250 million years agoC:60 million years ago D:65 million years ago
Our factory is much more productive now. This year’s production is five times as much （） it was ten years ago.AwhatBasCthatDthan
Our factory is much more productive now. This year’s production is five times as much （） it was ten years ago.A、whatB、asC、thatD、than
单选题Our factory is much more productive now. This year’s production is five times as much （） it was ten years ago.AwhatBasCthatDthan
单选题I have lived in this city thirty years ago, so I know it quite well.AinBthirty years agoCsoDquite well
问答题Challenges for Chinese Government China’s plans to diversify its ever-growing dollar mountain, while vague, are a welcome sign that the country will not try to sustain the unsustainable forever. They are not, however, meaningful steps towards repairing the cracks in the Chinese economy. China’s foreign reserves, the world’s largest, are now more than a trillion dollars. They are expected to increase by several hundred billion dollars more over the next year. Small wonder there is so much interest in how they are managed and where they are invested. Much of the money is now in US Treasury bonds, but it may eventually be managed more ambitiously, and by one or more new agencies.
问答题Practice 5 The world's oceans are slowly getting more acidic, say scientists. The researchers from California say the change is taking place in response to higher levels of carbon dioxide in the atmosphere. The lowering of the waters' pH value is not great at the moment but could pose a serious threat to current marine life if it continues, they warn. Ken Caldeira and Michael Wickett, from the Lawrence Livermore National Laboratory, report their concerns in the journal Nature. Increasing use of fossil fuels means more carbon dioxide is going into the air, and most of it will eventually be absorbed by seawater. Once in the water, it reacts to form carbonic acid. Scientists believe that the oceans have already become slightly more acidic over the last century. But these researchers have tried to predict what will happen in the future by combining what we know about the history of the oceans with computer models of climate change. "This level of acidity will get much more extreme in the future if we continue releasing CO2 into the atmosphere," said Dr Caldeira. "And we predicted amounts of future acidity that exceed anything we saw over the last several hundred million years, apart from perhaps after rare catastrophic events such as asteroid impacts." If carbon dioxide release continues unabated, ocean pH could be reduced by as much as 0.77 units, the authors warn. It is not absolutely clear what that means for marine life, however. Most organisms live near the surface, where the greatest pH change would be expected to occur, but deep-ocean lifeforms may be more sensitive to pH changes. Coral reefs and other organisms whose skeletons or shells contain calcium carbonate may be particularly affected, the team speculate. They could find it much more difficult to build these structures in water with a lower pH. In recent years some people have suggested deliberately storing carbon dioxide from power stations in the deep ocean as a way of curbing global warming. But Dr Caldeira said that such a strategy should now be re-considered. "Previously, most experts had looked at ocean absorption of carbon dioxide as a good thing — because in releasing CO2 into the atmosphere we warm the planet; and when CO2 is absorbed by the ocean, it reduces the amount of greenhouse warming.
填空题The boy passed the final exams. But if he had spent more time on them, the results (be) ____ much better.
单选题Thirty years ago, most teenagers had bicycles, but now they are comparatively rare.____56___,motor scooters (小型摩托车) are much more common.____57___, this may seem to be a sign of progress but____58___the change is not necessarily for the better. It is easy to see why young people prefer scooters.____59___, they are much faster and do not require much physical effort,____60___, you can take a passenger with you on the pillion（后座）seat behind;____61___,they give young people a feeling of independence, because they can travel further and impress their friends.____62___, the disadvantages are equally obvious.____63___first sight, scooters are more expensive to buy and to maintain, and____64___those under 16 are not allowed to have them.____65___, greater freedom brings danger because speed encourages young people to take risks and as a result scooters are involved____66___more accidents, and the accidents are____67___more serious. Bicycles are safer and easier to control.Years ago, teenagers had more experience with them because they____68___to ride as young children, and consequently knew what they were capable of.____69___, many young people overestimate what a scooter can do and pretend it has the power of a motorcycle.____70___, the fact is that bicycles are not very safe____71___.in cities these days because there are more cars and drivers are not used to them and do not make allowances for them. ____72___, those who are old enough to ride scooters naturally prefer them. Those who are too young or cannot afford to buy a scooter probably 6nd bicycles slow and uncomfortable____73___,and riding bicycles requires____74___experience of traffic than before. On balance, the change has been for the worse,____75___for the 13-and 14-year-olds, but the only safe solution would be to have special lanes（车道） for cyclists. 75 A. especially B.generally C.definitely D.certainlyAespeciallyBgenerallyCdefinitelyDcertainly