There was one thought that air pollution affected only the area immediately around large cities with factories and heavy automobile traffic. At present, we realize that although these are the areas with the worst air pollution, the problem is literally worldwide. On several occasions over the past decade, a heavy cloud of air pollution has covered the east of the United States and brought health warnings in rural areas away from any major concentration of manufacturing and automobile traffic. In fact, the very climate of the entire earth may be infected by air pollution. Some scientists consider that the increasing concentration of carbon dioxide in the air resulting from the burning of fossil fuels (coal and oil) is creating a “greenhouse effect”— conserving heat reflected from the earth and raising the world’s average temperature. If this view is correct and the world’s temperature is raised only a few degrees, much of the polar ice cap will melt and cities such as New York, Boston, Miami, and New Orleans will be in water.

Another view, less widely held, is that increasing particular matter in the atmosphere is blocking sunlight and lowering the earth’s temperature — a result that would be equally disastrous. A drop of just a few degrees could create something close to a new ice age, and would make agriculture difficult or impossible in many of our top farming areas. Today we do not know for sure that either of these conditions will happen (though one recent government report drafted by experts in the field concluded that the greenhouse effect is very possible). Perhaps, if we are lucky enough, the two tendencies will offset each other and the world’s temperature will stay about the same as it is now. Driven by economic profits, people neglect the damage on our environment caused by the “advanced civilization”. Maybe the air pollution is the price the human beings have to pay for their development. But is it really worthwhile?

46. As pointed out at the beginning of the passage, people used to think that air pollution _______.

　A. cause widespread damage in the countryside

　B. affected the entire eastern half of the United States

　C. had damaged effect on health

　D. existed merely in urban and industries areas

47. As to the greenhouse effect, the author __________.

　A. share the same view with the scientist.

　B. is uncertain of its occurrence

　C. rejects it as being ungrounded

　D. thinks that it will destroy the world soon

48. The word “offset” in the second paragraph could be replaced by _________.

　A. slip into   B. make up for　　 C. set up    D. catch up with

49. It can be concluded that ____________.

　A. raising the world’s temperature only a few degrees would not do much harm to life on earth

　B. lowering the world’s temperature merely a few degrees would lead major farming areas to disaster 

　C. almost no temperature variations have occurred over the past decade

　D. the world’s temperature will remain constant in the years to come

50. This passage is primarily about __________.

　A. the greenhouse effect        　    B. the burning of fossil fuels

　C. the potential effect of air pollution  　D. the likelihood of a new ice age

C
　　A scientist who developed a way to calculate(计算) how much water is used in the produciton of anything form a cup of coffee to a hamburger was awarded the 2008 Stockholm Water Prize.
　　Professor John Anthony Allan of the University of London in Britain won the award for introducing the idea of "virtual water(虚拟水)",a calculation method that has changed the nature of trade policy and research.
　　Allan has written seven books and published more than 100 papers.
　　The Stockholm International Water Institute said this idea is now embedded(埋藏) in the production of foods and industrial products.The institute said Allan's work had made a big effect on global trade policy and research,especially in water - scarce(缺水) regions.
　　"The improved understanding of trade and water management issues on local,regional and global scales are of the highest value for the successsful and sustainable(可持续的) use of water resources,"it said.
　　"People do not only use water when they drink it or take a shower,"the institute said. "Behind the morning cup of coffee,there are 140 liters of water that was used to grow,produce,package and ship the beans."That is about as much water as a person in England uses on average for all daily drinking and household needs.
　　"For a single hamburger,about 2,400 liters of water are needed.In te USA ,the average person uses nearly 7,000 liters of virtual water every day" It said that was more than three times the average use of a Chinese person.
　　64.Allan was awarded the prize because ______.
　　　A.he wrote seven books on trade policy
　　　B.he published more than 100 papers on water management
　　　C.he found a new kind of water in water - scarce areas
　　　D.he came up with the idea of virtual water
　　65.Which of the following is TRUE according to the passage?
　　　A.The average American uses about 7,000 liters of water a day.
　　　B.The average Chinese uses nearly 2,300 liters of virtual water a day.
　　　C.An Englishman usually drinks about 140 liters of coffee a day.
　　　D.A hamburger usually contains about 2,400 liters of water.
　　66.What effect does the idea of virtual water have?
　　　A.It helps us realize the importance of trade.
　　　B.It helps people do successful business.
　　　C.It helps us make use of water scientifically.
　　　D.It tells us how much water we use a day.
　　67.What does the underlined word "it" in the last paragraph refer to?
　　　A.The University of London.
　　　B.The calculation method.
　　　C.The Stockholm International Water Institute.
　　　D.The trade policy and research.

第二节完形填空（共20小题；每小题1.5分，满分30分）
阅读下列短文，从每小题的A、B、C、D四个选项中选出可以填入空白处的最佳选项。
　　Years ago a John Hopkin’s professor gave a group of graduate students this task: Go to the slums（平民窟）. 　31 200 boys, between the ages of 12 and 16, and 　32 their background and environment. Then predict their 　33 for the future.
　　The students, after 　34 social statistics, talking to the boys, and collecting much data, 　35　that 90 percent of the boy would spend some time in 　36 .
　　Twenty-five years later another group of graduate students was 　37 the job of testing the 　38 . They went back to the same area. Some of the boys— 39 men—were still there，a few had died，some had moved away， 40 they got in touch with 180 of the 　41 200. They found that only four of the group had ever been sent to prison.
　　　42 was it that these men，who had lived in a breeding place of crime，had such a 43 good record？ The researchers were continually told，“Well，there was a teacher…”
　　They pressed 　44 ，and found that in 75 percent of the 　45 it was the same woman. The researchers went to this teacher，now living in a home for retired 　46 . How had she had this remarkable influence 　47 that group of children？ Could she give them any reason why these boys 　48 have remembered her？
　　“No，”she said.“No I really couldn’t.”And then, 　49 back over the years，she said musingly，more to herself than to her 　50 ，“I loved those boys…”
31．A．Take 　　　　　　　　B．Elect　　　　　 C．Appoint　　　　 D．Mention
32．A．learn 　　　　　　　 B．inform　　　　　C．study 　　　　　D．describe
33．A．careers　　　　　　　B．statuses 　　　 C．promises 　　　 D．chances
34．A．checking 　　　　　　B．closing 　　　　C．storing 　　　　D．trying
35．A．drew 　　　　　　　　B．concluded 　　　C．decided 　　　　D．confirmed
36．A．hospital 　　　　　　B．prison 　　　　 C．camp 　　　　　 D．court
37．A．offered 　　　　　　 B．provided　　　　C．given 　　　　　D．served
38．A．result 　　　　　　　B．accuracy 　　　 C．effect 　　　　D．prediction
39．A．by then 　　　　　　B．so far 　　　　　C．as usual 　　　D．soon after
40．A．and 　　　　　　　　B．so 　　　　　　　C．but　　　　　　D．then
41．A．exact 　　　　　　　B．considerable 　　C．mere 　　　　　D．original
42．A．What 　　　　　　　 B．When 　　　　　　C．Why 　　　　　　D．Where
43．A．surprisingly　　　　B．relatively 　　　C．similarly 　　　D．undoubtedly
44．A．deeper 　　　　　　 B．further 　　　　 C．higher 　　　　D．wider
45．A．cases 　　　　　　　B．samples　　　　 C．affairs 　　　　D．examples
46．A．workers 　　　　　　B．teachers 　　　　C．professors　　　 D．guards
47．A．against 　　　　　　B．versus 　　　　　C．over 　　　　　　D．through
48．A．would 　　　　　　　B．should 　　　　　C．might 　　　　　D．could
49．A．calling　　　　　　 B．going 　　　　　　C．thinking 　　　D．remembering
50．A．students 　　　　　　B．relatives 　　　　C．roommates　　 D．questioners

We find that bright children are rarely held back by mixed-ability teaching. On the contrary, both their knowledge and experience are enriched. We feel that there are many disadvantages in streaming（把…按能力分班）pupils. It does not take into account the fact that children develop at different rates. It can have a bad effect on both the bright and the not-so-bright child. After all, it can be quite discouraging to be at the bottom of the top grade!
　　Besides, it is rather unreal to grade people just according to their intellectual (智力的) abilities. This is only one aspect of their total personality. We are concerned to develop the abilities of all our pupils to the full, not just their academic ability. We also value personal qualities and social skills, and we find that mixed-ability teaching contributes to all these aspects of learning.
　　In our classrooms, we work in various ways. The pupils often work in groups: this gives them the opportunity to learn to co-operate, to share, and to develop leadership skills. They also learn how to cope with personal problems as well as how to think, to make decisions, to analyze and evaluate, and to communicate effectively. The pupils learn from each other as well as from the teacher.
　　Sometimes the pupils work in pairs; sometimes they work on individual tasks and assignments, and they can do this at their own speed. They also have some library, and we teach them the skills they need in order to do this effectively. And expect our pupils to do their best, not their least, and we give them every encouragement to attain this goal.
1. Group work provides pupils with the opportunity_________.
　　A. to develop academic abilities                 　　 B. to learn to teach.
　　C. to do some experiments                        　　 D. to learn to be capable organizers.
2. By "held back" in the first paragraph the author means _________.
　　A. drawn to their studies                           　　     B. prevented from advancing
　　C. made to remain in the same classes         　　 D. forced to study in the lower classes
3. In the passage the author's attitude towards " mixed-ability teaching" is ________.
　　A.questioning               B. approving  　　     C. objective 　　 D. critical
4. The author's purpose of writing this passage is to _________.
　　A. offer advice on the proper use of the library
　　B. emphasize the importance of appropriate formal classroom teaching
　　C. argue for teaching bright and not -so-bright pupils in the same class
　　D. recommend pair work and group-work for classroom activities
5. The author argues that a teacher's chief concern should be the development of the student's _____.
　　A. total personality              　　                   B. intellectual ability
　　C. learning ability and communicative skills        D. personal qualities and social skills