[外语类试卷]大学英语六级模拟试卷692及答案与解析.doc

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1、大学英语六级模拟试卷 692及答案与解析 一、 Part I Writing (30 minutes) 1 For this part, you are supposed to write a short essay entitled Internet according to the following outline given below in Chinese. The first sentence of each paragraph has been given to you. 1. 因特网越来越普遍地进入到我们的学习、工作和生活当中 2. 因特网的益处 3. 因特网的消极方面 Int

2、ernet Internet has been playing an increasing role in our daily life. _. Internet has enabled us to do a lot of things more easily and quickly. _. However, if not managed properly, Internet can create many problems too. _. All in all, we cannot live without Internet now. _. 二、 Part II Reading Compre

3、hension (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 questions 1-4, mark： Y (for YES) if the statement agrees with the information given in the passage; N (for NO) if the s

4、tatement contradicts the information given in the passage; NG (for NOT GIVEN) if the information is not given in the passage. 1 Coping with Climate Change What we have learned so far about how climate changes is affecting our global environment. Studies show that it adversely affects human and natur

5、al systems by reducing biodiversity, impairing biological and chemical cycles and making it more difficult to restore degraded ecosystems. Climate is not the only factor in the deterioration of natural systems. We are making big changes to the landscape, altering land use and land cover in major way

6、s. These changes combined present a challenge to environmental management. Adaptive management is a scientific approach to managing the adverse impacts of climate and landscape change. Nature and Impacts of Climate Change Every week it seems there is an article about global warming in the news media

7、. It may be difficult for some to grasp the big picture of the issue, but in general, climate change has already or is expected to increase temperatures, particularly in the interior of continents, toward the poles and in winter boost precipitation (降水量 ) in wetter areas and suppress precipitation i

8、n drier areas increase rain and decrease snow lessen peak spring runoff and cause more even year-round flows of water, thereby reducing water availability during summer irrigation and navigation seasons increase evaporation of water during the summer enhance the likelihood of lower mean lake levels,

9、 drier wetlands, and water shortages, particularly in mountain regions raise the frequency and magnitude of extreme weather events, such as hurricanes, tornadoes, and floods raise global sea levels, causing some populated coastal areas to become inundated (被淹没的 ) reduce the extent and duration of Ar

10、ctic sea ice with adverse consequences for marine mammals increase the loss of glaciers in middle and equatorial latitudes, including premier mountain ecosystems such as Glacier National Park in Montana Global average temperature has increased by about 0.6 over the past 100 years, with a major warmi

11、ng upswing in the 1970s. Warming is the result, in part, of rapid increases in emissions of greenhouse gases (GHG), particularly carbon dioxide (CO2), which is a byproduct of the combustion of fossil fuels, such as coal, oil, and natural gas, used for power generation and transportation. When global

12、 temperatures rise and precipitation patterns change, it is expected there will be consequences on ecosystems, such as an increase in the spread of exotic species; redistribution of plants, animals, energy, water, and nutrients; alteration of natural processes and the structure and function of ecosy

13、stems. Northerly latitudes are particularly vulnerable to climate change. The Arctic Council, an intergovernmental forum for Arctic nations and indigenous people, reported that the northern ice cap is warming at twice the global rate and the Arctic region is expected to warm at two to three times th

14、e rate for the rest of the world. Arctic warming will have serious consequences on human and ecology. Nature and Impacts of Landscape Change Landscape change results from natural disturbances and human activities. Natural disturbances include fire, windstorms, avalanches, landslides, tree fall, floo

15、ds, and insect epidemics. Human activities causing landscape change include conversion of forestland to agriculture, drainage of wetlands, and forest fragmentation from road construction and timber harvesting. Human activities often have a more significant effect on landscapes than natural disturban

16、ces because they alter the availability of energy, water, and nutrients to ecosystems; increase the spread of exotic species; accelerate natural processes of ecosystem change; and adversely affect the structure and functioning of ecosystems. Human-induced landscape change has accelerated during the

17、past several decades because of rapid population and economic growth, particularly in countries such as China, India, and Brazil. Landscape change has contributed to a dramatic 1,000-fold increase in species extinction over the past 400 years. On a global basis, nearly 1.2 million km2 of forest and

18、woodland and 5.6 million km2 of grassland and pastureland have been converted to other uses. During the last three centuries, 12 million km2 of cropland were lost. Between 1982 and 1997, 121,000 km2 of non-federal land were urbanized in the United States. More than 90 percent of the land in the lowe

19、r 48 states has been logged, plowed, mined, grazed, paved, or otherwise modified from previous conditions. Human-induced landscape change significantly affects wildlife. For example, between 1970 and 2000, rural residential development in the Montana and Wyoming portions of the Greater Yellowstone E

20、cosystem increased 400 percent. Consequently, current and potential grizzly bear habitat on private lands in the ecosystem has been degraded and fragmented. Double-digit growth in residential subdivisions adjacent to the National Elk Refuge in Jackson, Wyoming, has diminished winter range for the 10

21、,000 elk that use the refuge and displaced corridors that elk use to reach summer range in Yellowstone and Grand Teton National Parks. Another example of significant impacts from landscape change is the Crown of the Continent Ecosystem. This ecosystem covers the Rocky Mountains in British Columbia a

22、nd Alberta, Canada, and western Montana, United States. Here are some specifics: Most old-growth forests that once existed outside of protected parks and wilderness areas have been harvested. Many rivers in the region have been altered by hydroelectric power development. Significant farm, ranch, and

23、 forest acreage has been converted to homes and commercial developments. Lakes and streams have been polluted by agricultural and urban runoff. Fish and wildlife habitats have been degraded. Active and proposed energy developments threaten protected areas. Large areas have been invaded by nonnative

24、species. The desire to preserve the outstanding wildlife (especially large carnivores) and environmental amenities (舒适 ) from the negative effects of rapid economic growth and development in the northern Rocky Mountain region prompted creation of the Yellowstone to Yukon Conservation Initiative. The

25、 initiative involves 300 conservation organizations and covers an area larger than the states of California and Texas combined, including the Greater Yellowstone and Crown of the Continent Ecosystems. Coping with Climate and Landscape Change Although climate and landscape change has positive effects

26、 on human and natural systems, it is expected to have many adverse impacts that deserve attention. Ecosystems have an inherent capacity to resist climate and landscape change, known as ecological resilience (复原能 ). When this capacity is exceeded, the ecosystem can change in ways that may not be soci

27、ally and ecologically acceptable. So what can be done? Mitigation strategies can reduce ecosystem vulnerability. Mitigation strategies are actions to prevent, reduce, or slow climate and/or landscape change. The Kyoto Protocol to the United Nations Framework Convention on Climate Change, which took

28、effect in February 2005, is a prime example of a climate change mitigation strategy. The protocol commits 36 industrialized countries to curb GHG emissions, especially CO2. Limiting increases in global temperature by 2 would require keeping atmospheric concentrations of CO2 below 400 parts per milli

29、on (ppm). Current concentrations are about 375 ppm. Benefits of the Kyoto Protocol may be limited because it does not include some developed countries, which emit substantial GHGs, and developing countries where rapid population and economic growth is expected to dramatically increase GHG emissions.

30、 Other mitigation strategies include increasing the use of alternative energy sources and technologies (clean coal, renewable energy, ethanol, hybrid vehicles, and nuclear power). Although the United States did not sign the Kyoto Protocol, 28 states have programs to curb CO2 emissions, and at least

31、166 U.S. cities have agreed to apply the Kyoto emission reduction standards to their communities. Other initiatives, like the Apollo Alliance, bring together labor unions, environmental and business groups, and activist organizations with the mission of sharply reducing U.S. dependence on fossil fue

32、ls. The alliance is seeking ways to do the following: power the economy with hydrogen produced from renewable energy resources implement green construction codes revitalize urban centers to reduce urban sprawl determine how industry can store rather than emit carbon into the atmosphere The Apollo Al

33、liance expects to invest 300 billion in new energy technologies and energy conservation over 10 years as a way to eliminate U.S. dependence on foreign oil and create millions of good-paying jobs. These funds would be raised using tax incentives, public bonds, capital strategies, and other mechanisms

34、. 2 The article tells us that climate and landscape change adversely affects our global environment. （ A） Y （ B） N （ C） NG 3 Global warming only results from rapid increases in emissions of greenhouse gases. （ A） Y （ B） N （ C） NG 4 The Arctic is warming faster than the rest of the world. （ A） Y （ B）

35、 N （ C） NG 5 Global warming leads to many new diseases. （ A） Y （ B） N （ C） NG 6 Compared with human activities, _ have a less important impact on landscapes. 7 Wildlife is significantly affected by _. 8 Most old-growth forests that are outside of protected parks and _ have been harvested. 9 When eco

36、logical resilience is exceeded, the ecosystem becomes _ unacceptable. 10 There are mitigative ways to help reduce _. 11 The Kyoto Protocol requires _- to curb GHG emissions, especially CO Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end

37、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, C and D, and decide which is the best answer. （ A）

38、 Mary is worthy of the prize. （ B） Mary has granted the prize. （ C） Mary fails in the speech contest. （ D） The man doesnt think Mary deserves the prize. （ A） Driving a car. （ B） Taking a taxi. （ C） Taking a train. （ D） Going by subway. （ A） He dislikes museums and galleries. （ B） He does not care ab

39、out the weather. （ C） Going to the beach is the best choice. （ D） He doesnt want to go to Washington. （ A） She wants to live in the suburbs. （ B） She is offended by her naughty children. （ C） She disagrees with father. （ D） She turns a deaf ear to her husbands words. （ A） Call her after five. （ B） M

40、ake calls from her phone. （ C） Go to the meeting with her. （ D） Fix his phone. （ A） Husband and wife. （ B） Teacher and student. （ C） Policeman and driver. （ D） Mother and son. （ A） At the library. （ B） At the airport. （ C） At the post office. （ D） At the teachers office. （ A） He is good at drawing p

41、ictures. （ B） He likes pictures very much. （ C） He likes visiting the art museum very much. （ D） He thinks the art museum is a very quiet place. （ A） Studying for a test. （ B） Visiting a close fiend of theirs. （ C） A class presentation theyre preparing. （ D） A television program the man is watching.

42、 （ A） He thought she preferred to study alone. （ B） He thought she had made arrangements to study with. （ C） He had told her that he had done poorly on a recent test. （ D） He didnt know that she was enrolled in a linear algebra course. （ A） He and Elizabeth argued recently. （ B） Hed rather study in

43、his own dormitory. （ C） He heard Elizabeth did poorly on the last test. （ D） He doesnt want to bother Elizabeth so late in the evening. （ A） Saying sorry to bother him. （ B） offering him some help. （ C） Asking help from him. （ D） Complaining some problem with her. （ A） Because the dishwasher broke d

44、own. （ B） Because Ms. Connors said shed take care of it （ C） Because a month went by and nothing happened. （ D） Because Ms. Connors is threatening to evict her for not paying the full rem. （ A） Because the dishwasher broke down. （ B） Because it sounds pretty serious to get the dishwasher broken. （ C

45、） Because she could have gotten the repair herself. （ D） Because Paula deducted the cost from the rent check. （ A） Because Sam is a law school student. （ B） Because Sam is her best friend. （ C） Because Sam is her classmate. （ D） Because Sam has some free time. Section B Directions: In this section,

46、you will hear 3 short passages. At the end of each 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） Lack of money. （ B） The increased standar

47、d of living. （ C） No government help. （ D） Disagreement with their parents. （ A） The homeless are willing to live under a bridge or in a cardboard box. （ B） You will not find homeless people in countries with a high standard of living. （ C） The mentally-ill live on the stress because they want the c

48、ompany of other homeless people. （ D） The unemployed who receive help may still be among the homeless. （ A） A cap. （ B） Acar. （ C） A home. （ D） A covering. （ A） They were small. （ B） They were fuel-efficient. （ C） They were oil consuming. （ D） They were not attractive. （ A） They couldnt get enough i

49、ncome to keep them running. （ B） Young people couldnt afford to pay the tuition fees. （ C） Keeping them running at the same level would cast much more. （ D） Social services need more state funds because of the recession. （ A） Young people couldnt afford their own tuition in the 1970s. （ B） Fewer parents could afford to send their children to college in the 1970s. （ C） Its difficult for graduates from colleges to find a job in the 1970s. （ D） Institutions of higher