[外语类试卷]大学英语四级模拟试卷238及答案与解析.doc

1、大学英语四级模拟试卷 238及答案与解析 一、 Part I Writing (30 minutes) 1 For this part, you are allowed 30 minutes to write an essay with no less than 120 words based on the following directions. First you are required to decide on a proper topic and then supply the necessary information to complete each paragraph. Re

2、member to write neatly. 1. 请指出下面这段话的寓意。 2. 分析造成的原因。 3. 提出解决该问题的措施或设想。 祖上以打猎为生 爷爷以卖上等木材为生 父亲以卖劈柴和柴墩为生 儿子以卖根雕原料为生 孙子以卖黄沙为生 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 and answer the questions at

3、tached 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. 1 Japanese Computer Is World

4、s Fastest, as U.S. Falls Back The worlds fastest computer A Japanese laboratory has built the worlds fastest computer, a machine so powerful that it matches the raw processing power of the 20 fastest American computers combined and far outstrips the previous leader, an 1. B. M. -built machine. The a

5、chievement, which was reported today by an American scientist who tracks the performance of the worlds most powerful computers, is evidence that a technology race that most American engineers thought they were winning handily is far from over. American companies have built the fastest computers for

6、most of the last decade. The accomplishment is also a vivid statement of contrasting scientific and technology priorities in the United States and Japan. The Japanese machine was built to analyze climate change, including global warming, as well as weather and earthquake patterns. By contrast, the U

7、nited States has predominantly focused its efforts on building powerful computers for simulating weapons, while its efforts have lagged in scientific areas like climate modeling. A competition between Japan and U. S. For some American computer scientists, the arrival of the Japanese supercomputer ev

8、okes the type of alarm raised by the Soviet Unions Sputnik(人造地求卫星 )satellite in 1957. Several United States computer scientists said the Japanese machine reflected differences in style and commitment that suggest that United States research and spending efforts have grown complacent (自满的 )in recent

9、years. For now, the new computer will be used only for climate research, and American scientists have already begun preparing to move some of their climate simulation research to run on the Japanese machine. “The Japanese clearly have a level of will that we havent achieved,“ said Thomas Sterling, a

10、 computer designer at the California Institute of Technology. “These guys are blowing us out of the water, and we need to sit up and take notice.“ Wide applications of the magic power The new Japanese supercomputer will have both scientific and practical applications. It will be used for advanced mo

11、deling of theories about global warming and climate change, and it will be able to predict short-term weather patterns. Advances in computer speed today routinely extend computer simulation into all areas of science and engineering as complex calculations take an increasingly shorter time. Because i

12、ncreases in computing power tend to have exponential (指数的 )results, a problem that could take years for even the fastest computers today might be finished in hours on the new Japanese computer. The ability to track the path of a typhoon, for example, is of immediate relevance to the island nation of

13、 Japan. Improved prediction made possible by a more powerful computer might save lives and property. Computer simulation has become a standard tool in both science and modern design of products ranging from drugs to bicycles. Computers that are more powerful make possible simulations that are more a

14、ccurate and can reduce cost and increase efficiency. At one time, for example, computers were capable of computing the flow of air over a single airplane wing but can now cover the entire aircraft. The new Japanese supercomputer was financed by the Japanese government and has been installed at the E

15、arth Simulator Research and Development Center in Yokohama (横滨 ), west of Tokyo. The Japanese government spent $ 350 million to $ 400 million developing the system over the last five years, according to Dr. Akira Sekino, president and chief executive of HNSX Supercomputers, a unit of the NEC Corpora

16、tion based in Littleton, Colo. The new computer was formally dedicated last month, and the Japan Marine Science and Technology Center said yesterday that the machine had reached more than 87 percent of its theoretical peak speed. NEC sells a scaled-down version of the new supercomputer. Several Unit

17、ed States universities and government agencies have tried to buy the machines over the lust decade for purposes like aircraft simulation, seismic (地震的 )studies and molecular modeling. But sales have been thwarted (反对 )by resistance from the Commerce Department and members of Congress, who complained

18、 that NEC was “dumping“ the machines, or selling them below cost. Last year Cray Inc., a United States maker of supercomputers, entered into a marketing agreement to sell the machines in the United States, but no sales have been announced. A new machine The NEC supercomputers are based on vector pro

19、cessing (矢量处理 ), a way of using specialized hardware to solve complex calculations that was pioneered by the American supercomputer designer Seymour Cray. The concept has generally fallen out of favor in the United States in recent years. Assembled from 640 specialized modes that are in turn compose

20、d of 5104 processors made by NEC, the new Japanese supercomputer occupies the space of four tennis courts and has achieved a computing speed of 35.6 trillion mathematical operations a second. The processors are linked in a way that allows extremely efficient operation compared with the previously fa

21、stest “massively parallel“ computers, which are based on standard parts rather than custom-made chips. The earth simulator project is intended to create a “virtual earth“ on an NEC supercomputer to show what the world will look like under various climate conditions by means of advanced numerical sim

22、ulation. The system is intended to serve as a research platform for international teams of researchers, and United States scientists are planning to participate in new projects made possible by the more powerful computer. By comparison, the fastest American supercomputer, which until now held the wo

23、rld computing speed record, is the ASCI White Pacific computer at the Lawrence Livermore National Laboratory in California. Based on I. B. M. processors, it has achieved a top speed of 7 trillion math operations a second. Debate and cooperation The Japanese supercomputer underscores a continuing deb

24、ate within the computer design community. One camp has argued for building massively parallel supercomputers by chaining together thousands of off-the-shelf microprocessors. That philosophy has come to dominate designs in the United States in recent years. A second camp has pushed for computers made

25、 from specialized processors dedicated to solving a particular class of problem. Scientists from the National Center for Atmospheric Research in Boulder, Colo., said they were planning to work with the Japanese earth simulation center to convert United States weather modeling codes to work with the

26、new computer. 2 According to the passage, IBM corporation is the previous reader to make computer. （ A） Y （ B） N （ C） NG 3 Compared with Japanese focus on climate change, the Untied States tried to build powerful computers for satellites launching. （ A） Y （ B） N （ C） NG 4 The arrival of the Japanese

27、 supercomputer makes some American scientists feel disappointed. （ A） Y （ B） N （ C） NG 5 In the authors eyes, America has already been falling back in some fields about computers. （ A） Y （ B） N （ C） NG 6 The increase in computing power will contribute most significantly to the development of educati

28、on. （ A） Y （ B） N （ C） NG 7 The sales of the new supercomputers have come across resistance from the Commerce Department and members of Congress because they can not meet the needs of the America. （ A） Y （ B） N （ C） NG 8 Seymour Cray was the first to make use of vector processing. （ A） Y （ B） N （ C）

29、 NG 9 The NEC supercomputer can operate over _ times as fast as the fastest American supercomputer. 10 The philosophy that dominates the computer design in the United States is to build supercomputers by chaining together _ 11 The American scientists were planning to cooperate with the Japanese in _

30、 in order to make use of the supercomputer. Section A Directions: In this section, you will hear 8 short 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.

31、 After each question there will be a pause. During the pause, you must read the four choices marked A, B, C and D, and decide which is the best answer. （ A） The flight has been canceled. （ B） The plane is late. （ C） The plane is on time. （ D） The tickets for this flight have been sold out. （ A） He i

32、s not to blame. （ B） It was his fault. （ C） He will accept all responsibility. （ D） He will be more careful next time. （ A） She has been dismissed for her poor performance. （ B） She has been fired by the company. （ C） She has been granted leave for one month. （ D） She has been offered a new job. （ A

33、） There will be heavy fog in all areas. （ B） There will be heavy rain by midnight. （ C） There will be heavy fog in the east. （ D） There will be fog in all areas by midnight. （ A） Shes scornful. （ B） Shes angry. （ C） Shes sympathetic. （ D） Shes worried. （ A） He likes the job of a dish-washer because

34、it pays well. （ B） He thinks its important to have a good job from the beginning. （ C） He hates to be a dish-washer because its boring. （ D） He would work as a dish-washer in summer if he has to. （ A） She must learn to understand Johns humor better. （ B） She enjoys Johns humor a great deal. （ C） She

35、 doesnt appreciate Johns humor. （ D） She thinks John is not funny enough. （ A） Joan may have taken a wrong train. （ B） Joan wont come to the conference. （ C） Joan will miss the next conference. （ D） Joan may be late for the opening speech. （ A） His friend. （ B） His sister. （ C） His mother. （ D） His

36、colleague. （ A） A small place with a nice view of the city. （ B） A spacious apartment that includes cable TV. （ C） An apartment downtown with free parking. （ D） An apartment outside the downtown area. （ A） He should be careful when using his credit cards. （ B） He ought to sell his car to save money.

37、 （ C） He should stop spending money on entertainment. （ D） He ought to find a cheaper apartment in the downtown area. （ A） The poor places are getting richer. （ B） The rich places are getting richer. （ C） The poor places are getting poorer. （ D） Both B and C. （ A） The poor are unemployed. （ B） All t

38、he poor have no land. （ C） The poor have no houses in big cities. （ D） There is no hope for the poor in the village. （ A） Rural unemployment. （ B） Urban unemployment. （ C） No housing in the villages. （ D） NO foreign aid in the villages. （ A） He was very young when his grandpa was born. （ B） He never

39、 played basketball with his grandpa. （ C） He would hang out with his grandpa when his grandpa was 18. （ D） He was too old to play basketball and stuff. （ A） He was sorry they could never play ball together. （ B） He was sorry he could never tell story to him. （ C） He was sorry he was too old to play

40、basketball and stuff. （ D） He was sorry that he was too occupied with his work. （ A） unconvincing. （ B） persuasive. （ C） disgusting. （ D） praiseworthy. （ A） Because they cannot stand the continual nagging of their children. （ B） Because they have to give in to their childrens demands. （ C） Because t

41、hey are deeply moved by their childrens honesty. （ D） Because they can be considerate of their childrens needs. （ A） Practice requires him to be honest. （ B） Dishonesty is not a virtue. （ C） Honesty may make him suffer. （ D） Honesty is the best policy. （ A） They avoid telling lies and are friendly t

42、o others. （ B） They usually like telling lies. （ C） They often tell lies for their own sake. （ D） They prefer their relatives to friends. （ A） Children are honest by nature. （ B） Children should be taught to be honest. （ C） Children should learn to tell harmless lies when necessary. （ D） Children ma

43、y learn from experience to be dishonest. （ A） Evidence conclusion. （ B） Analysis confirmation. （ C） Statement support. （ D） Statement support-restatement. Section B Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage

44、 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） Gold was discovered. （ B） The Transcontinental Railroad was completed. （ C） The Golden Gate Bridge was constructed. （ D） Telegraph communications w

45、ere established with the East. （ A） Two million. （ B） Three million. （ C） Five million. （ D） Six million. （ A） Nineteen million dollars. （ B） Thirty-two million dollars. （ C） Thirty-seven million dollars. （ D） Forty-two million dollars. Section C Directions: In this section, you will hear a passage

46、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 blanks numbered from 36 to 43 with the exact words you have just heard. For blanks numbered from 44 to 46 you are

47、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 36 There is no doubt that adults, and even highly educated adults, vary greatly in the speed and 【 B1】 _ of their reading. Some 【 B2】 _ very slowly throughout; othe

48、rs dash 【 B3】 _ too quickly and then have to regress(退回 ). Poor readers in 【 B4】 _ may lack the ability to vary their manner of reading according to the type of reading matter and to their intentions in reading it. A good reader can move at great speed through the text of a novel or 【 B5】 _ light re

49、ading matter. He may be able to skim a page, picking up a word or two here and there, and gain a general idea of what the text is about without really reading it. In reading more difficult material, with the intention of taking in the whole of it, he will proceed more slowly, but even then he will 【 B6】 _ his pace, concentrating on the key words and passages, perhaps re-reading 【 B7】 _ several times, and pass more quickly over the remainder. A less efficient reader tends to 【 B8