1、大学英语四级 246 及答案解析(总分：746.52，做题时间：130 分钟)一、Writing (30 minutes)(总题数：1，分数：30.00)1.For this part, you are required to write a composition on the topic Shopping Through the Internet according to the following outline (given in Chinese). Your composition should be no less than 120 words. Remember to write
2、 your composition on the Answer Sheet I clearly and neatly. 1. 有人认为网上购物将越来越普及 2. 有人此并不乐观 3. 我的预测 （分数：30.00）_二、Reading Comprehensio(总题数：1，分数：71.00)How Global Warming Works Gases in the Earths atmosphere act like glass in a greenhouse-trapping heat and making life on Earth possible. But there is a del
3、icate balance. Burning coal, oil and natural gas increases atmospheric concentrations of these gases. Over the past century, increases in industry, transportation, and electricity production have increased gas concentrations in the atmosphere faster than natural processes can remove them leading to
4、human-caused warming of the globe. The Sources Of Global Warming The major source of global warming is carbon dioxide pollution from power plants, auto mobiles, and industry. Another source is global deforestation. Power plants are responsible for more than a third of U. S. CO2 emissions, yet there
5、are no caps on CO2 emissions from power plants or any other industry. Gas guzzling cars and light trucks are also responsible for a third of U.S. CO2 emissions. Current regulations allow for very inefficient vehicles which spew tons of CO2. Trees remove carbon dioxide from the air as they grow. When
6、 they are cut and burned that CO2is released back into the atmosphere. Massive deforestation around the globe is releasing large amounts of CO2 and decreasing the forests ability to take CO2from the atmosphere. Solutions The U. S. , with only four percent of the worlds population, is responsible for
7、 22 percent of the worlds greenhouse gas emissions. Fortunately, solutions exist to cut our global warming emissions. Decision makers in the United States should take the following steps. Increasing fuel efficiency standards for cars and light trucks would cut millions of tons of CO2 pollution as we
8、ll as decreasing dependence on foreign oil. Putting a cap on CO2 from power plants would cut millions of tons of CO2 pollution as well as decreasing pollution that causes acid rain, smog, and respiratory illness. Shifting investment from fossil fuels like coal and oil to renewable energy and energy
9、efficiency would allow cleaner, more sustainable sources of energy to take their rightful place as market leaders. Ratification of the Kyoto Protocol would be a modest but important first step to ward international emissions reductions. The Evidence Recently, alarming events that are consistent with
10、 scientific predictions about the effects of climate change have become more and more commonplace. The global average temperature has increased by about 0.5C and sea level has risen by about 10 inches (25cm) in the past century. Official confirmation came in 1995, when the Intergovernmental Panel on
11、 Climate Change, an officially appointed international panel of over 2,500 of the worlds leading scientific experts, found that evidence suggests a human influence on the global climate. The following are events which consistent with scientists predictions of the effects of global warming: The past
12、two decades have witnessed a stream of new heat and precipitation re cords. The 10 hottest years on record have all occurred since 1980, the hottest year ever on record is 1997, and the hottest January through July on record occurred in 1998. Glaciers are melting around the world. Alaskas Columbia G
13、lacier has retreated more than eight miles in the last 16 years while temperatures there have increased. A section of an Antarctic ice shelf as big as the District of Columbia broke off. Severe floods like the devastating Midwestern floods of 1993 and 1997 are becoming more common. Infectious diseas
14、es are moving into new areas as seen in the recent outbreaks of Dengue fever in Texas and Malaria in New Jersey. The Opposition The Global Climate Coalition, a powerful coalition of oil, power, and auto companies has followed the lead of tobacco companies by denying the harm they cause. They have sp
15、ent millions of dollars trying to discredit the scientific consensus of the IPCC and slow steps to combat global warming. The public has not fallen for their deception, but the Global Climate Coalition appears to have had some impact on members of Congress. Health Risks Rates of infectious disease w
16、ill rise, with the spread of mosquitoes and other disease carrying organisms that thrive in warm, wet climates. More frequent and more severe heat waves will pose a threat to public health, with children and the elderly especially vulnerable. In the 1990s, outbreaks of malaria have occurred in Michi
17、gan, Texas, Florida, Georgia, California, New Jersey and New York. Two major heat waves-in Chicago in 1995 and Dallas in 1998-killed more than 600 people. Environmental Destruction Rising global temperatures and melting of glaciers will directly impact ocean and coast al habitats. Ecosystems will, b
18、e destroyed and species will die off, as sea levels rise, sea sons shift, and glaciers and polar ice caps melt. Polar bears are threatened with starvation as melting sea ice keeps them from their food. Catastrophic Weather Warmer temperatures will speed evaporation, leading to drought in some places
19、 and heavy downpours and flooding in others. Extreme weather events as well as El Ninno events may become more intense and more frequent. In 1999, the U. S. experienced one of the most extreme droughts ever recorded, and Maryland, New Jersey, Rhode Island and Delaware faced their driest growing seas
20、ons on record. That same year, the Pacific North west experienced its second wettest year on record. Nevada, California and Iowa all experienced deadly floods. Recent years have seen record hurricanes, including the most destructive ever. Clean Energy Agenda A rapid transition to energy efficiency a
21、nd renewable energy sources will combat global warming, protect human health, create new jobs, protect habitat and wildlife, and ensure a secure, affordable energy future. In contrast, our reliance on coal, oil and nuclear power imperils the worlds climate, fouls the environment, harms human health,
22、 and results in the proliferation of nuclear materials. We can meet our energy needs without threatening our childrens future using commonsense ways to mobilize American ingenuity and re sources for a rapid transition to renewable energy sources. It will eliminate energy waste, phase out fossil fuel
23、s and nuclear power, and help the United States lead the world into a sustainable energy future, Clean Power In the next decade, increase fourfold the amount of energy obtained from non-hydro renewable sources such as the sun and wind. By 2020, produce at least one-third of the nations energy from r
24、enewable sources, and double the efficiency of energy use in homes, buildings, transportation and industry. Clean Air Clean up our power plants by setting progressively tighter limits on all power plant pollution-including carbon dioxide, the major cause of global warming. Close the loophole that al
25、lows old coal-fired power plants to pollute much more than newer plants. Clean Cars Hold sport utility vehicles, pickup trucks and minivans to the same air pollution standards as cars. Improve the fuel efficiency of new cars and light trucks to a combined average of 45 miles per gallon (MPG) by 2010
26、 and at least 65 MPG by 2020. Offer incentives that build strong markets for renewable fuels and for clean vehicles powered by hybrid motors and fuel cells. Clean Investments Quadruple federal investments in renewable energy and energy efficiency within five years, and continue this momentum over th
27、e long term Stop spending taxpayer dollars to subsidize the coal, oil and nuclear industries. Provide adequate resources and job training for affected workers and communities to ensure a just transition to a sustainable energy economy. （分数：71.00）(1).The passage gives an overview of the effects of gl
28、obal warming on the United States. （分数：7.10）A.YB.NC.NG(2).Slightly less than a third of CO2 emissions in the United States are caused by deforestation. （分数：7.10）A.YB.NC.NG(3).The United States is the worlds No. 1 emitter of greenhouse gases. （分数：7.10）A.YB.NC.NG(4).If American cars were slightly more
29、 efficient, the United States would not be dependent on foreign oil. （分数：7.10）A.YB.NC.NG(5).The Intergovernmental Panel on Climate Change and the Global Climate Coalition have similar aims. （分数：7.10）A.YB.NC.NG(6).Global warming endangers animals by damaging or destroying their habitats. （分数：7.10）A.Y
30、B.NC.NG(7).Changing to a sustainable energy economy means that some workers in conventional energy industries will lose their jobs. （分数：7.10）A.YB.NC.NG(8). 1 are the largest source of greenhouse pollutants in the United States. （分数：7.10）填空项 1:_(9).Higher temperatures in the United States have encour
31、aged disease-carrying organisms which spread 1 such as malaria. （分数：7.10）填空项 1:_(10).Rainfall patterns in the United States have been unusual in recent years, with some states experiencing drought whilst others experience 1. （分数：7.10）填空项 1:_三、Listening Comprehens(总题数：1，分数：15.00)A.The man enjoys trav
32、eling by car.B.The man lives far from the subway.C.The man is good at driving.D.The man used to own a car.A.Tony should continue taking the course.B.She approves of Tonys decision.C.Tony can choose another science course.D.She cant meet Tony so early in the morning.A.She has to study for the exam.B.
33、She is particularly interested in plays.C.Shes eager to watch the new play.D.She can lend her notes to the man.A.They will be replaced by on-line education sooner or later.B.They will attract fewer kids as on-line education expands.C.They will continue to exist along with on-line education.D.They wi
34、ll limit their teaching to certain subjects only.A.Most students would like to work for a newspaper.B.Most students find a job by reading advertisements.C.Most students find it hard to get a job after they graduate.D.Most students dont want jobs advertised in the newspapers.A.Move the washing machin
35、e to the basement.B.Turn the basement into a workshop.C.Repair the washing machine.D.Finish his assignment.A.Some students at the back cannot hear the professor.B.The professor has changed his reading assignment.C.Some of the students are not on the professors list.D.The professor has brought extra
36、copies of his assignment.A.She doesnt want to talk about the contest.B.Shes modest about her success in the contest.C.Shes spent two years studying English in Canada.D.Shes very proud of her success in the speech contest.A.Talking about sports.B.Writing up local news.C.Reading newspapers.D.Putting u
37、p advertisements.A.They shouldnt change their plan.B.Theyd better change their mind.C.The tennis game wont last long.D.Weather forecasts are not reliable.四、Section B(总题数：2，分数：10.00)A.A working boy.B.An advertiser.C.A middle school student.D.A college student.A.His home is too far away.B.The dorm is
38、too noisy.C.He doesnt like pop music.D.There is no dorm available.A.The young man doesnt keep a pet.B.The young man is good at bargaining.C.No one would like to rent her apartment if she doesnt do so.D.She prefers to rent her apartment to an industrious young man.A.$100.B.$150.C.$155.D.$160. Questio
39、ns 23 to 25 are based on the conversation you have just heard.A.To get the best of your lifecontinuing education.B.Continuing education for a better job and better salary.C.To learn what we enjoy in continuing education.D.Continuing education for people with initiative.A.Marie has fulfilled herself
40、in life and work after continuing education.B.Marie has guts to take the continuing education and succeeded.C.By taking continuing education, Marie became the Chief Nurse.D.Continuing education makes Marie make good use of her full potential.A.Education.B.Medicine.C.Handicraft.D.Literature.A.20.B.25
41、.C.35.D.45A.Posters allow people to eat poorly.B.A bad diet is a symptom of social, cultural, and economic problems.C.Poor people are not aware of the four food groups.D.Alcohol contributes to a bad diet.A.They are not the solution to dietary problems.B.They do not illustrate all the food groups.C.T
42、hey are not based on medical research.D.They are only to wealthy people.A.Cultural problems.B.Social problems.C.Economic problems.D.Physical problems.A.A film.B.A radio programme.C.A book.D.A TV programme.A.Four.B.Forty.C.Eight.D.A number of.A.A U. S. serviceman.B.A producer.C.A correspondent.D.A Ku
43、wait worker.A.A Just War.B.After the War Was Over.C.A War, Doubted but Rewarding.D.A War, Worthless and Meaningless.A.How to improve your reasoning ability.B.Why classical music is popular with math students.C.The difference between classical music and rock music.D.The effects of music on the result
44、s of math tests.A.Because it keeps you calm.B.Because it strengthens your memory.C.Because it stimulates your nerve activity.D.Because it improves your problem solving strategies.A.The effects of music do not last long.B.Piano music could interfere with your reasoning ability.C.Music, whether classi
45、cal or rock, helps improve your memory.D.The more you listen to music, the higher your test scores will be.六、Section C(总题数：1，分数：10.00)The Library of Congress is Americas national library. It has millions of books and other objects. It has newspapers, (36) 1publications as well as letters of (37) 2 i
46、nterest. It also has maps, photographs, art (38) 3, movies, sound recordings and musical (39) 4. All together, it has more than 100 million objects. The Library of Congress is open to the public Monday through Saturday, except for public holidays. Anyone may go there and read anything in the . But n
47、o one is (40) 5 to take books out of the building. The Library of Congress was (41) 6in 1800. It started with eleven boxes of books in one room of the Capitol Building. By 1814, the had increased to about 3,000 books. They were all (42) 7that year when the Capitol was burned down during Americas war
48、 with Britain. To help re-build the library, Congress bought the books of President Thomas Jefferson. Mr. Jeffersons (43) 8included 7,000 books in seven languages. (44) 9.Today, three buildings hold the librarys . (45) 10. It buys some of its books and gets others as gifts. It also gets materials through its copyright office. (46) 11.This means the Library of Congress receives almost everything that is published in the United States. （分数：10.00）填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填空项 1:_填
