[外语类试卷]大学英语四级模拟试卷357及答案与解析.doc

1、大学英语四级模拟试卷 357及答案与解析 一、 Part I Writing (30 minutes) 1 For this part, you are allowed thirty minutes to write a composition on the topic Changing Criteria for Judging a Good Student. You should write at least 120 words and you should base your composition on the outline (given in Chinese) below. Chan

2、ging Criteria for Judging a Good Student 1以往判断一个好学生的标准； 2现今判断一个好学生的标准发生了哪些变化； 3这些变化是符合社会要求的。 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 attached to the passage. For q

3、uestions 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 Degraded Land in South China Damaging agricultural and

4、 forestry practices over the past years have degraded half of the land in China bounded by the Tropic of Cancer and the South China Sea, dramatically reducing its biological productivity and environmental services. The damage to South Chinas hilly tropical/subtropical(亚热带的 ) forests probably began i

5、n the Sung Dynasty as population expanded to the south. The settlers most likely used cutting and bum techniques to clear land for fanning. Forest cover provided building materials and firewood to the settlers, but also served as a habitat(栖息地 ) for tigers, leopards, wild pigs, and deer. Population

6、growth put severe pressure on the land. Eventually, erosion (腐蚀 ) washed away much of the top soil and much of the degraded land was abandoned. Today, only about one square kilometer of the original tropical evergreen broad-leaved forest remains. Impacts The most direct impact of this disastrous los

7、s of productive soil is reduced agricultural production. Farmers trying to produce crops under these conditions face great difficulties even when using commercial fertilizers(化肥 ). The soil is poor at holding the plant nutrients(营养 ) contained in commercial fertilizers. The problem is deteriorated b

8、y the fact that fertilizer runs off the land quickly during heavy rains. China cannot afford to abandon potentially productive land, let alone lose more to erosion. It is already losing enormous amounts of land to new towns and other non-agricultural uses. Per capita amble land (人均可耕种土地 ) in China n

9、ow is about 0.1 hectare, only 47 percent of the world average. But China estimates that it lost about 50,000 square kilometers of its amble land from 1986 to 1995, the equivalent of the total agricultural land area of Japan. Food production is not the only problem. The loss of much of China s forest

10、 cover today has made wood products China s leading import costing the country $ 2 to $ 5 billion annually. Economic losses also result from waterlogged (水涝的 ) fields and coastal sand storms that result directly from the soil erosion. Some 710 million tons of sediment(沉淀物 )were carried through the T

11、hree Gorges(三峡 ) part of the Yangtze in 1998-a 33 percent increase over the loads measured before 1990. In parts of Guangdong Province, sediment-choked streams and rivers have caused the water table to rise and have waterlogged nearby farm fields. Since the waterlogged land is useless for convention

12、al fanning, the Chinese introduced the “dam-pond system“. Ponds are dug and used for raising fish and vegetables are grown on the tops of the dam surrounding the ponds. This system may have to be ridiculously stopped if erosion is controlled. Once controlled, the streams and rivers will cut deeper c

13、hannels, thus lowering the water level in the fishponds. In the few areas where reforestation (重新造林 ) of eroded hills has reduced erosion and sediments in the rivers, the river has begun to cut through years of deposited sediment to return to its original bed. This lower water table(地下水位 ) reduces w

14、ater logging of nearby land and the fishponds begin to dry up. In some places, pumps had to be installed to draw water from the streams and rivers to keep the water level in the fishponds stable. Sandstorms are another effect of the heavy sediment load created when granite (花岗岩 )weathers (风化 )in the

15、 wet tropics. Coarse quartz(粗的石英 ) sands move from the weathered hills to lower elevations during heavy rains, filling valleys and covering agricultural fields. Fine-grained quartz sands, however, are carried further downstream and deposited near river mouths. Strong sea winds and typhoons regularly

16、 blow the sand inland, burying agricultural fields and human settlements. To reduce the movement of sand by wind action, the Chinese built windbreaks(防风林 )along much of the sandcovered coastal belt. Salt-tolerant (耐盐的 )trees, satisfactory for such coastal windbreaks, were planted near the shore. Bec

17、ause these trees are exposed to local people looking for firewood, the government normally prohibits tree cutting but allows them to dump rubbish beneath the trees for cookingfuel. Loss of covering plants and soil means that heavy tropical rains flow rapidly into streams and rivers, causing disastro

18、us flooding. The damaging floods and landslides(山崩 ) in lands adjacent to the Yangtze and Yellow Rivers in 1998 were a direct consequence of the loss of forests and other plant in the rivers headwaters(上游 ) and over-fanning. These floods killed many and destroyed homes, roads, bridges, and other con

19、struction. In Jiangxi province alone, the government had to resettle 600 thousand people from along the flooded Yangtze River. Some Solutions Scientists in research institutions throughout South China have worked for decades to develop and test methods for restoring degraded lands to productive land

20、s using a combination of agriculture and forestry methods called agroforestry. Since funds are scarce and the problem is large, any practical solution must be able to begin creating an income for .the regions farmers within a few years. This has led to some creative and promising strategies for rest

21、oring some of the most severely weathered regions. Techniques, of course, must be adapted to fit each cultural and environmental region. Many of the most effective approaches rely on knowledge gathered from traditional systems practiced by ethnic minority groups in the affected regions. The process

22、starts with a fast growing ground cover that can shade the soil and make it possible for other seeds to grow. Care must be taken to ensure that this new cover survives the dry season when grass fires present serious hazards. Fire prevention can be extremely difficult in areas where open flames are u

23、sed for cooking and for religious practices. These early plantings are typically made at the beginning of the rainy season when the ground is comparatively cool. he wet season gives the plants an opportunity to establish themselves and provide leaf cover for shade. It is essential to pick pioneer sp

24、ecies that can provide some income for farmers in the first year income that will sustain the farmers until other crops establish themselves. Part of the art is finding a combination of crops that can occupy the same site. Above ground, this means matching demands for sunlight and shade. Rubber tree

25、s, for example, require bright sunlight, but valuable herbs(药草 ) can be grown in their shade. Below ground, it is essential to arrange mot systems of intercropped plants so they do not compete excessively for water and soil nutrients. Once established, these systems contribute organic material to th

26、e soil, slow rainfall runoff, help make up groundwater reservoirs, and reduce water and wind erosion. Deep tree roots help to fix the soil and prevent landslides, and the shade from the leaves lowers the local surface air temperatures, facilitating crop growth. In many eases, birds and other wildlif

27、e return to reestablished habitats (栖息地 ) in the area. One of the greatest challenges is finding ways to make productive use of the varied type of land of Southern China including the steep hillsides. Fanning hilly areas is essential because urban development is forcing farmers off many lowland area

28、s. A technique called stereoagriculture has been developed in which forests are restored to the hilltops while a mixture of intercropped orchards (果树 )and food crops, fishponds, and small animal grazing(放牧 )are introduced in the flatter lands below. 2 Degraded land in South China results from excess

29、ive cutting and burning of forests by expanded population. （ A） Y （ B） N （ C） NG 3 Farmers can improve agricultural production by using more and more expensive fertilizers to make the degraded land get enough nutrients. （ A） Y （ B） N （ C） NG 4 New towns and other non-agricultural uses occupy large a

30、mounts of degraded land. （ A） Y （ B） N （ C） NG 5 Waterlogged fields and coastal sand storms make people in parts of Guangdong Province introduce the “dam-pond system“ to raise fish in the pond and grow vegetables on tops of the dam around the pond. （ A） Y （ B） N （ C） NG 6 Reforestation is forbidden

31、in order not to reduce erosion and sediments in the rivers in some areas, otherwise “dam-pond system“ may have to be stopped. （ A） Y （ B） N （ C） NG 7 Windbreaks are planted along the sand-covered coastal belt to reduce the movement of sand blowing inland by wind action. （ A） Y （ B） N （ C） NG 8 Loss

32、of coveting plants and soil may change the climate and even bring about flooding rain in the affected area. （ A） Y （ B） N （ C） NG 9 Agroforestry is the combination of_ methods to restore degraded lands to productive lands developed and tested by research scientists. 10 How the ground cover should be

33、 planted can be a kind of art with more consideration of growing crops that_. 11 _is very important because urban development is forcing farmers off many lowland areas. Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversatio

34、n, 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, C and D, and decide which is the best answer. （ A） It was very expens

35、ive. （ B） Henry lost it. （ C） Mary didnt like it. （ D） It was very big. （ A） He is younger than his brother. （ B） He no longer resembles his brother. （ C） He does not get along well with his brother. （ D） He doesnt spend much time with his brothers children. （ A） They dont have to go to the cinema.

36、（ B） His sister will let them use the car. （ C） The bus is free with her. （ D） Theyll have to rent a car as early as possible. （ A） Shes still looking for a topic. （ B） Its almost finished. （ C） It seems promising. （ D） Its taking all her time. （ A） Make some coffee. （ B） Meet the woman at the libra

37、ry. （ C） Continue to read. （ D） Go out with some friends. （ A） Look for a less expensive car. （ B） Buy a new car. （ C） Help the woman paint her car. （ D） Buy a car from the woman. （ A） He doubts the woman will like the novel. （ B） He enjoyed reading the novel. （ C） Hell lend the woman the novel afte

38、r he has read it. （ D） He hasnt started reading the novel yet. （ A） In an apartment. （ B） In a bookstore. （ C） In a classroom. （ D） In a library. （ A） Oxford. （ B） Birmingham. （ C） Shaftsbury. （ D） London. （ A） The city is a tourist attraction. （ B） Most visitors go to the city to see the British Mu

39、seum. （ C） Buckingham Palace is the most attractive scenic spot to foreign visitors. （ D） The visitor will probably have no time to go to the theater in the evening. （ A） The visitor will see very little of the city. （ B） The visitors schedule is extremely full for the day. （ C） The visitor will be

40、able to see most of the city. （ D） The visitor will leave for another city the next day. （ A） Because David liked animal. （ B） Because it was Davids birthday. （ C） Because she liked pets. （ D） Because David had asked her for one. （ A） She wanted to buy something useful. （ B） She wanted to buy someth

41、ing extraordinary. （ C） $he wanted to buy something expensive. （ D） $he wanted to buy something valuable. （ A） It meant he disliked the thought of having a snake in the house. （ B） It meant he was afraid David would put the snake in his bedroom. （ C） It meant he was afraid that the snake would hurt

42、David. （ D） It meant he wouldnt enter his bedroom until David took the snake out of it. （ A） A snake. （ B） A rabbit. （ C） A bird. （ D） She was still hesitating. 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 p

43、assage 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） It works faster than human brain. （ B） It seldom makes errors. （ C） It can solve complicated problems. （ D） It can “think“ without informatio

44、n fed into it. （ A） its vacuum tubes. （ B） Its electronic circuits. （ C） Computer programs. （ D） All of the above. （ A） The advantages and disadvantages of computers. （ B） The future of the computer. （ C） The main features of the computer. （ D） The scientific principles of the computer. （ A） To show

45、 Charles Dickenss good memory. （ B） To tell people that Charles Dickens is writer. （ C） To illustrate that great men usually have good memory. （ D） To compare Charles Dickens with other great men of the world. （ A） Because they are absent-minded in school. （ B） Because they are tired of learning it.

46、 （ C） Because they can not understand the rules. （ D） Because they have so little time for it. （ A） A good memory is very helpful in peoples development. （ B） A mans mind is exactly like a modern camera. （ C） Man can Keep a picture in his mind with no difficulty. （ D） Mens memory is usually better t

47、han womens. （ A） The silk covering made by an insect. （ B） The silk covering made by a silkworm. （ C） The soft protective covering made by an animal. （ D） The hard protective covering made by an animal. （ A） By chance. （ B） Two monks told them. （ C） The passage doesnt tell the story in detail. （ D）

48、By reading a story about a young princess. （ A） Thanks to the few eggs the monk took Out of China secretly. （ B） Thanks to the few eggs the Chinese gave the two monks. （ C） Thanks to the bamboo canes the monks carried out of China. （ D） Thanks to the discovery of the secret of the cocoon. （ A） No on

49、e knows exactly how silk was made. （ B） No one knows exactly when silk was made. （ C） The history of the silk is a fascinating story. （ D） The Chinese people kept the secret of how to make silk for as long as 4,000 years. 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 blanks numbered from 36 to 43 with the exac