[外语类试卷]大学英语四级模拟试卷105及答案与解析.doc

1、大学英语四级模拟试卷 105及答案与解析 一、 Part I Writing (30 minutes) 1 1社会习惯的不同普遍存在； 2美国和中国习惯的不同之处； 3我们的做法。 Different Social Customs Between Americans and Chinese 二、 Part II Reading Comprehension (Skimming and Scanning) (15 minutes) Directions: In this part, you will have 15 minutes to go over the passage quickly an

2、d answer the questions attached to the passage. For questions 1-7, mark： Y (for YES) if the statement agrees with the information given in the passage; N (for NO) if the statement contradicts the information given in the passage; NG (for NOT GIVEN) if the information is not given in the passage. 2 T

3、esting Times Researchers are working on ways to reduce the need for animal experiments, but new laws may increase the number of experiments needed. The current situation In an ideal world, people would not perform experiments on animals. For the people, they are expensive. For the animals, they are

4、stressful and often painful. That ideal world, sadly, is still some way away. People need new drugs and vaccines. They want protection from the toxicity of chemicals. The search for basic scientific answers goes on. Indeed, the European Commission is forging ahead with proposals that will increase t

5、he number of animal experiments carried out in the European Union, by requiring toxicity tests on every chemical approved for use within the unions borders in the past 25 years. Already, the commission has identified 140,000 chemicals that have not yet been tested. It wants 30,000 of these to be exa

6、mined right away, and plans to spend between 4 billion 8 billion ($5 billion 10 billion) doing so. The number of animals used for toxicity testing in Europe will thus, experts reckon, quintuple (翻五倍 ) from just over lm a year to about 5m, unless they are saved by some dramatic advances in non-animal

7、 testing technology. At the moment, roughly 10% of European animal tests are for general toxicity, 35% for basic research, 45% for drugs and vaccines, and the remaining 10% a variety of uses such as diagnosing diseases. Animal experimentation will therefore be around for some time yet. But the searc

8、h for substitutes continues, and last weekend the Middle European Society for Alternative Methods to Animal Testing met in Linz, Austria, to review progress. A good place to start finding alternatives for toxicity tests is the liver-the organ responsible for breaking toxic chemicals down into safer

9、molecules that can then be excreted. Two firms, one large and one small, told the meeting how they were using human liver cells removed incidentally during surgery to test various substances for long-term toxic effects. One way out of the problem PrimeCyte, the small firm, grows its cells in culture

10、s over a few weeks and doses them regularly with the substance under investigation. The characteristics of the cells are carefully monitored, to look for changes in their microanatomy. Pfizer, the big firm, also doses its cultures regularly, but rather than studying individual cells in detail, it co

11、unts cell numbers. If the number of cells in a culture changes after a sample is added, that suggests the chemical in question is bad for the liver. In principle, these techniques could be applied to any chemical. In practice, drugs (and, in the case of PrimeCyte, food supplements) are top of the li

12、st. But that might change if the commission has its way: those 140,000 screenings look like a lucrative market, although nobody knows whether the new tests will be ready for use by 2009, when the commission proposes that testing should start. Other tissues, too, can be tested independently of animal

13、s. Epithelix, a small firm in Geneva, has developed an artificial version of the lining of the lungs. According to Huang Song, one of Epithelixs researchers, the firms cultured cells have similar microanatomy to those found in natural lung linings, and respond in the same way to various chemical mes

14、sengers. Dr. Huang says that they could be used in long-term toxicity tests of airborne chemicals and could also help identify treatments for lung diseases. The immune system can be mimicked and tested, too. ProBioGen, a company based in Berlin, is developing an artificial human lymph node (淋巴结 ) wh

15、ich, it reckons, could have prevented the neardisastrous consequences of a drag trial held in Britain three months ago, in which (despite the drag having passed animal tests) six men suffered multiple organ failure and nearly died. The drug the men were given made their immune systems hyperactive. S

16、uch a response would, the firms scientists reckon, nave teen identified by their lymph node, which is made from cells that provoke the immune system into a response. ProBioGens lymph node could thus work better than animal testing. A second alternative Another way of cutting the number of animal exp

17、eriments would be to change the way that vaccines are tested, according to Coenraad Hendriksen of the Netherlands Vaccine Institute. At the moment, all batches of vaccine are subject to the same battery of tests. Dr. Hendriksen argues that this is over-rigorous. When new vaccine cultures are made, b

18、elt-and-braces tests obviously need to be applied. But if a batch of vaccine is derived from an existing culture, he suggests that it need be tested only to make sure it is identical to the batch from which it is derived. That would require fewer test animals. All this suggests that though there is

19、still some way to go before drugs, vaccines and other substances can be tested routinely on cells rather than live animals, useful progress is being made. What is harder to see is how the use of animals might be banished from fundamental research. Weighing the balance In basic scientific research, w

20、here the object is to understand how, say, the brain works rather than to develop a drug to treat brain disease, the whole animal is often necessarily the object of study. Indeed, in some cases, scientific advances are making animal tests more valuable, rather than less. Geneticmodification techniqu

21、es mean that mice and rats can be remodelled to make them exhibit illnesses that they would not normally suffer from. Also, genes for human proteins can be added to them, so that animal tests will more closely mimic human responses. This offers the opportunity to understand human diseases better, an

22、d to screen treatments before human trials begin. However, the very creation of these mutants (突变异种 ) counts as an animal experiment in its own right, so the number of experiments is increasing once again. What is bad news for rodents, though, could be good news for primates. Apes and monkeys belong

23、 to the same group of mammals as humans, and are thus seen as the best subjects for certain sorts of experiment. To the extent that rodents can be “humanised“, the number of primate experiments might be reduced. Some people, of course, would like to see them eliminated altogether, regardless of the

24、effect on useful research. On June 6th the British Union for the Abolition of Vivisection, an animal-rights group, called for the use of primates in research to be banned. For great apes, this has already happened. Britain, Austria, the Netherlands, New Zealand and Sweden have ended experiments on c

25、himpanzees, gorillas, bonobos and orang-utans. Experiments on monkeys, though, are still permitted. And some countries have not banned experiments on apes. In America, for example, about 1,000 chimpanzees a year are used in research. This is a difficult area. Great apes are mans closest relatives, h

26、aving parted company from the human family tree only a few million years ago. Hence it can be (and is) argued that they are indispensable for certain sorts of research. On the other hand, a recent study by Andrew Knight and his colleagues at Animal Consultants International, an animal-advocacy group

27、, casts doubt on the claim that apes are used only for work of vital importance to humanity. Important papers tend to get cited as references in subsequent studies, so Mr. Knight looked into the number of citations received by 749 scientific papers published as a result of invasive experiments on ca

28、ptive chimpanzees. Half had received not a single citation up to ten years after their original publication. That is damning. Animal experiments are needed for the advance of medical science, not to mention peoples safety. But if scientists are to keep the sympathy of the public, they need to do bet

29、ter than that. 2 The passage summarizes harmful effects of animal experiment. However, as animal experiment is indispensable in a number of areas, it might not be stopped or replaced by other alternatives. （ A） Y （ B） N （ C） NG 3 Animal experiments are needed in research to find new drugs and vaccin

30、es, and to find ways of protection from the toxicity of chemicals. （ A） Y （ B） N （ C） NG 4 It is predicted by experts that the number of animals used for toxicity testing in Europe will quintuple due to a plan to have a large variety of chemical tested. （ A） Y （ B） N （ C） NG 5 People are trying to f

31、ind alternatives to animal testing, and they started with liver. （ A） Y （ B） N （ C） NG 6 PrimeCyte and Pfizer began to find alternatives to animal testing because they were advocates of animal protection. （ A） Y （ B） N （ C） NG 7 It is found that tissues from liver, lung, and immune system can all be

32、 tested independently of animals. （ A） Y （ B） N （ C） NG 8 Although there is more than one alternative to animal experiment, there is still concern over how to eliminate animal testing in fundamental research. （ A） Y （ B） N （ C） NG 9 In basic scientific research, the object is to understand how, say,

33、 the brain works rather than to develop a drug to _ brain disease. 10 Indeed, in some cases, scientific advances are making animal tests 11 Recently, an animal-advocacy group casts doubt on the scientists claim that apes are used only for Section A Directions: In this section, you will hear 8 short

34、conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversation and the questions will be spoken only once. After each question there will be a pause. During the pause, you must read the four choices marked A, B,

35、 C and D, and decide which is the best answer. （ A） He is pleased the exhibit has closed. （ B） He has already seen the exhibit. （ C） He is disappointed the exhibit has closed. （ D） He already knew the exhibit had closed. （ A） The professor has graded the paper. （ B） The professor has been in the mee

36、ting all week. （ C） The professor hate, to grade the paper. （ D） The professor has read his paper on the meeting. （ A） The traffic. （ B） The weather. （ C） Their health. （ D） Their timetable. （ A） The man knows Dr. Brown very wall. （ B） The woman should see doctors, but not Dr. Brown. （ C） Dr. Brown

37、is not a senior doctor. （ D） Dr. Brown is a very qualified doctor. （ A） The woman will sand the man to his office tomorrow. （ B） The man will go downtown with the woman tomorrow. （ C） The man will have to leave earlier than usual. （ D） The woman cant give the man a ride tomorrow. （ A） He doubts the

38、woman will like the novel. （ B） He hasnt started reading the novel yet. （ C） He enjoyed reading the novel. （ D） Hell lend the woman the novel after he has read it. （ A） Buy a car from the woman. （ B） Help the woman paint her ear. （ C） Buy a new car from the car market, （ D） Look for a less expensive

39、 car. （ A） The woman does not like the loud music. （ B） The woman does not like music. （ C） The woman has the same taste with the man. （ D） The woman used to like music. （ A） Extreme stress. （ B） Hair loss. （ C） Declining health. （ D） Unemployment. （ A） Old friends. （ B） Brother and sister. （ C） Col

40、leagues from work. （ D） Boss and employee. （ A） Its ugly. （ B） Its expensive. （ C） It does harm to the skin. （ D） It may drop off his head anytime. （ A） At a restaurant. （ B） In a shopping mall. （ C） In a library. （ D） In a classroom. （ A） Literature. （ B） Philosophy. （ C） Sociology. （ D） History. （

41、 A） It hasnt been bought by the librarian. （ B） It has been taken by a student. （ C） It has been lent out. （ D） It has been placed on reserve. （ A） Only one hour. （ B） Some hours. （ C） One week. （ D） Two weeks. Section B Directions: In this section, you will hear 3 short passages. At the end of each

42、 passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A, B, C and D. （ A） The religious significance. （ B） The custom of giving gifts. （ C） The habit of spending it

43、with the family. （ D） The custom of food that day. （ A） Family members. （ B） Friends and colleagues. （ C） Parents and grandparents. （ D） Family and friends. （ A） It is for people to relax. （ B） It is for people to make boxes. （ C） It is for people to enjoy excitement. （ D） It is for people to eat to

44、o much. （ A） Human brains differ considerably. （ B） The brain a person is born with is important in determining his intelligence. （ C） An environmentally handicapped person wont attain his due level of intelligence. （ D） Environment is important in determining a persons intelligence. （ A） 85. （ B） 1

45、00. （ C） 110. （ D） 125. （ A） It can be predicted at birth. （ B） It stays the same throughout his life. （ C） It can be increased by education. （ D） It is inherited from his parents. （ A） People enjoy sport. （ B） There are general principles governing sport. （ C） Sport makes war less likely. （ D） Spor

46、t is enjoyed by common people. （ A） Beating your opponent. （ B） Having fun. （ C） Doing your best to show your talent. （ D） Having award and reputation. （ A） Patriotic. （ B） Savage. （ C） Shamed. （ D） Even more competitive. （ A） Behavior of the players. （ B） The attitude of the spectators. （ C） The at

47、titude of the players. （ D） The number of medals Section C Directions: In this section, you will hear a passage three times. When the passage is read for the first time, you should listen carefully for its general idea. When the passage is read for the second time, you are required to fill in the bl

48、anks numbered from 36 to 43 with the exact words you have just heard. For blanks numbered from 44 to 46 you are required to fill in the missing information. For these blanks, you can either use the exact words you have just heard or write down the 37 Scientists in India have discovered a way to make

49、 bamboo plants produce flowers in laboratory. The British【 B1】 Nature recently reported the【 B2】 event. In the wild it can take as long as one hundred and twenty years for some kinds of bamboo to flower, and after the plant【 B3】 its seeds it dies. The bamboo plant is used in many different ways. But because it takes so long to produce seeds, scientists never【 B4】 it a traditional farm crop. The recent【 B5】 in India may change that. The【 B6】 was done at the National Chemical Laboratory in India. Three scientists cut t