1、大学六级-920 及答案解析(总分：712.00，做题时间：90 分钟)一、Part Writing(总题数：1，分数：106.00)1.1. 近来移动 QQ、移动飞信等通信方式在大学生中十分流行2. 这通信方式有许多优点3. 我的观点The Popularity of Instant Messaging Technologies（分数：106.00）_二、Part Reading Compr(总题数：1，分数：70.00)Natural-gas VehiclesKermit the Frog once said,“ Its not that easy being green. “Althou
2、gh he wasnt referring to cars, his observation seems particularly appropriate for the auto industry today: designing, developing and marketing “green“ cars has not been an easy task, which is why gasoline-powered vehicles still rule the world and fossil fuels still account for almost 75 percent of t
3、he worlds energy consumption. As gasoline soar and concern over harmful emission mounts, however, cars that run on alternate fuel sources will become increasingly important. A natural-gas vehicle, or NGV, is the perfect example of such a car - its fuel-efficient, environmentally friendly and offers
4、a relatively low cost of ownership. Natural gas basicsThe word“ gas“ is a confusing term because it is used to describe many different substances that are similar but not exactly the same. For example, the“ gas“ you put in your car is gasoline, one component of crude oil, or petroleum. Petroleum is
5、a dark, sticky liquid mixture of compounds formed underground by the decay of ancient marine animals.Natural gas also comes from the decay of ancient organisms, but it naturally takes a gaseous form instead of a liquid form. Natural gas commonly occurs in association with crude oil. It is derived fr
6、om both land plants and aquatic (水生的) organic matter and forms above or below oil deposits. It is often dissolved in crude oil at the high pressures existing in a reservoir. There are also reservoirs of natural gas, known as non-associated gas, that contain only gas and no oil.Natural gas consists p
7、rimarily of methane (沼气) and other hydrocarbon gases. Hydrocarbons are organic compounds composed only of the elements carbon and hydrogen. The hydrocarbons in natural gas are called saturated hydrocarbons (饱和烃) because they contain hydrogen and carbon bound together by single bonds.Like gasoline, n
8、atural gas is combustible (易燃的) ,which means it can be used in a combustion engine like gasoline. But cars that could burn natural gas didnt appear on the scene until the 1930s. From field to fordWe extract natural gas trapped in underground reservoirs by drilling wells into the earth. A modem well,
9、 equipped with diamond-studded drill bits, can drill to depths approaching 25,000 feet.Throughout the 19th century, the use of natural gas remained localized because there was no way to transport large quantities of gas over long distances. In 1890, the invention of a leakproof pipeline coupling mad
10、e it possible to transport gas miles from the source. Improvements in pipeline technology continued over the next two decades until long-distance gas transmission became practical. From 1927 to 1931, laborers constructed more than 10 major natural gas transmission systems in the United States, makin
11、g natural gas a viable energy source for many applications. The oil shortages of the late 1960s and early 1970s brought renewed interest in natural gas as a fuel source, especially for automobiles.Today, owners of natural-gas vehicles can fill up their cars at one of 1,300 fueling stations located i
12、n the United States. Honda also offers a personal natural gas pump to people who purchase its natural-gas-powered Civic. The pump uses a homes existing natural gas lines and can be installed for500 to 1,500.Natural-gas vehicle designNatural-gas vehicles use the same basic principles as gasoline-powe
13、red vehicles. In other words, the fuel ( natural gas in this case) is mixed with air in the cylinder of a four-stroke engine and then ignited by a spark plug to move a piston (活塞) up and down. Although there are some differences between natural gas and gasoline in terms of flammability and ignition
14、temperatures, NGVs themselves operate on the same fundamental concepts as gasoline-powered vehicles.Still, some modifications are required to make an NGV work efficiently. These changes are primarily in the fuel storage tank, the engine and the chassis (底盘).AdvantagesThe biggest advantage of NGVs is
15、 that they reduce environmentally harmful emissions. Natural-gas vehicles can achieve up to a 93 percent reduction in carbon monoxide emissions, 33 percent reduction in emissions of various oxides of nitrogen and a 50 percent reduction in reactive hydrocarbons when compared to gasoline vehicles. NGV
16、s also rate higher in particulate matter 10 (PM10) emissions. PM10 particles transport and deposit toxic materials through the air. NGVs that operate in diesel applications can reduce PM10 emissions by a factor of 10.Natural-gas vehicles also offer these benefits:NGVs are safer. The fuel storage tan
17、ks on an NGV are thicker and stronger than gasoline or diesel tanks. There has not been an NGV fuel-tank rupture in more than two years in the United States.Natural gas costs are lower than gasoline. On average, natural gas costs one-third less than gasoline at the pump.Natural gas is convenient and
18、 abundant.-A well-established, pipeline infrastructure exists in the United States to deliver natural gas to almost every urban area and most suburban areas. There are more than 1,300 NGV fueling stations in the United States, and more are being added every day.Natural gas prices have exhibited sign
19、ificant stability compared to oil prices. Historically, natural gas prices have exhibited significant price stability compared to the prices of petroleum-based fuels. This stability makes it easier to plan accurately for long-term costs.NGVs have lower maintenance costs. Because natural gas burns so
20、 cleanly, it results in less wear and tear on the engine and extends the time between tune-ups and oil changes.DisadvantagesOne of the biggest complaints about NGVs is that they arent as roomy as gasoline cars. This is because NGVs have to give up precious cargo and trunk space to accommodate the fu
21、el storage cylinders. Not only that, these cylinders can be expensive to design and build - a contributing factor to the higher overall costs of a natural-gas vehicle compared to a gasoline-powered car.Another drawback is the limited driving range of NGVs, which is typically about half that of a gas
22、oline-powered vehicle. For example, Hondas natural gas Civic, the Civic GX, can go up to 220 miles without refueling. A typical gasoline-powered Civic can go approximately 350 miles without refueling. If a dedicated NGV ran out of fuel on the road, it would have to be towed to the owners home or to
23、a local natural gas refueling station, which might be harder to find than a “regular“ gas station.Finally, it should be noted that natural gas, like gasoline, is a fossil fuel and cannot be considered a renewable resource. While natural gas reserves in the United States are still considerable, they
24、are not inexhaustible. Some predict that there are enough natural gas reserves remaining to last another 67.1 years, assuming that the 2003 level of production continues.（分数：70.00）(1).The gasoline-powered vehicles are prevalent as a result of _.（分数：7.00）A.comparatively low price of fossil fuelsB.red
25、ucing less harmful emissionsC.difficult tasks to design, develop and sale “green“ carsD.high fuel efficiency and protecting environment(2).What is the principal constituent of natural gas?（分数：7.00）A.Carbon and hydrogen.B.Methane and other hydrocarbon gases.C.Saturated hydrocarbons.D.Non-associated g
26、as.(3).The first car that could use natural gas as power in the combustion engine emerged in the history came out in _.（分数：7.00）A.the 19th centuryB.the 1930sC.the late 1960sD.the early 1970s(4).Why did people reconsider to make natural gas as a fuel source in the late 1960s and early 1970s?（分数：7.00）
27、A.Because the price of gasoline was high.B.Because natural-gas vehicles are much faster than other vehicles.C.Because people made much account of environmental protection.D.Because it was short of oil.(5).In the United States, the fueling stations offering for filling natural gas have reached to _.（
28、分数：7.00）A.1,300B.500C.1,500D.2,500(6).The piston of a natural-gas vehicle moves up and down by the power of _.（分数：7.00）A.the spark plugB.the four-stroke engineC.the air in the cylinderD.the heat of natural-gas burning(7).Compared to gasoline-powered cars, the natural-gas vehicles possess the unparal
29、leled benefit of _.（分数：7.00）A.reduction in carbon monoxide emissionsB.reduction in emissions of oxides of nitrogenC.reduction in particulate matter 10D.reduction in environmentally harmful emissions(8).Natural gas burns so cleanly that the owners of the natural-gas vehicles have _.（分数：7.00）填空项 1:_(9
30、).NGVs arent as roomy as gasoline cars because they have to give up cargo and trunk space to accommodate _.（分数：7.00）填空项 1:_(10).Both natural gas and gasoline can not be considered renewable resources, because they are _.（分数：7.00）填空项 1:_三、Part Listening Com(总题数：0，分数：0.00)四、Section A(总题数：3，分数：105.00)Q
31、uestions 11 to 18 are based on the conversation you have just heard.（分数：56.00）A.The bus stop.B.The bad weather:C.The late bus.D.The traffic jam.A.A scientist.B.A weather reporter.C.A farmer.D.A worker.A.Its cloudy.B.It drizzles.C.It showers.D.It rains heavily.A.Great but tiring.B.Relaxing and memora
32、ble.C.Unsatisfactory and exhausting.D.Exhausting but worthwhile.A.Ms Reed is going to Sydney on April 17th.B.Mr. Farnsworth is going to Sydney on flight 430.C.The flight leaves at 3:20 p. m.D.They are talking at the ticket office.A.Go shopping.B.Cook meals.C.Eat out.D.Buy a refrigerator.A.Three days
33、 ago.B.Four days ago.C.Five days ago.D.Six days ago.A.The mans clock was broken.B.The woman worked late yesterday.C.The man will help the woman with her work.D.The man doesnt believe the womans words.Questions 19 to 21 are based on the conversation you have just heard.（分数：21.00）A.Communication means
34、 person-to-person talking.B.Communication means emails and letters between colleagues.C.Communication means interactions between people.D.Communication means understanding between employees and clients.A.Its the most important part of communication.B.Its the only way to make an employee look profess
35、ional.C.Its vital to have good communication between colleagues.D.Its helpful to make a good impression on clients.A.Employees would perform the best if they have good communication with employers.B.Career success depends on how an employee develops his job skills.C.Companies hold social events only
36、 to help employee build good private relationships.D.Miscommunication shall affect the growth of a company.Questions 22 to 25 are based on the conversation you have just heard.（分数：28.00）A.Spending more hours on the Internet.B.Spending fewer hours on the Internet.C.Their brighter expectations not bei
37、ng met.D.Their bad state of being on the Internet.A.The Net is not healthy for people.B.The Net does not help with peoples communication.C.The Net is healthier than TV.D.The Net does no good to peoples psychological well-being.A.Because people give too much time to the Internet.B.Because people have
38、 more friends on the Internet.C.Because people have less face-to-face conversations than before.D.Because people stay at home longer than before.A.The fast-developing technology.B.The increasing information and communication via the Net.C.The way how people make use of the Internet.D.The people who
39、design different applications.五、Section B(总题数：3，分数：70.00)Passage OneQuestions 26 to 28 are based on the passage you have just heard.（分数：21.00）A.It locates in the mountains.B.It is 5,000 feet above the sea level.C.There are about 4,500 residents in this town.D.It experienced a fire 7 years ago.A.Seve
40、nty percent.B.Eighty percent.C.Ninety percent.D.Ninety-five percentA.She has the ability to afford only one trees removal.B.She doesnt want her trees to be removed.C.She will apply for the state and federal loans.D.She thinks that the planners are inconsiderate.Passage TwoQuestions 29 to 31 are base
41、d on the passage you have just heard.（分数：21.00）A.Because this will help them catch criminals.B.Because this will help them control the crime rate.C.Because this will help them reduce the number of lawsuits.D.Because this will help them save much manpower and time.A.Five million dollars.B.Forty thous
42、and dollars.C.One million dollars.D.Fifty thousand dollars.A.Most of them like it.B.Most of them hate it.C.Most of them doubt its necessity.D.Most of them doubt its feasibility.Passage ThreeQuestions 32 to 35 are based on the passage you have just heard.（分数：28.00）A.He only wants to change his daught
43、ers grade.B.He wants to have the teacher apologize to his daughter.C.He only asks for compensation for emotional damages.D.He wants to change the grade and compensation.A.The Swim team.B.The Chinese chess club.C.The Girl Scouts.D.The church choir.A.She is 26 years old.B.She is Virginias economics te
44、acher.C.This is the first year of her teaching career.D.Few of her friends are African-Americans.A.He supports the student.B.He supports the teacher.C.He will keep neutrality.D.He hasnt shown his attitude.六、Section C(总题数：1，分数：77.00)The American idea of respecting human rights came from several sourc
45、es. First, the colonists had been (36) . of their rights in the Old World. They realized that peoples rights must be (37) . Moreover, the Bible and literature from Greece and Rome taught that people are born with basic rights. As a result, the U. S. Constitution included 10 (38) to guarantee citizen
46、s basic rights. This “Bill of Rights” promised freedom of religion, freedom of speech and of the press, the right to bear arms and the right to a (39) trial.Throughout American history, the belief in (40) human rights has influenced government policies and laws. Slavery (41) argued that even slaves
47、had rights as human beings. Finally, after the Civil War, slavery was (42) . As industries developed, many people protested the poor working conditions. Eventually, laws were passed (43) workers fair wages and working hours and prohibiting child labor. The Civil Rights Movement used human rights arg
48、uments in the fight against discrimination.Human rights have become a global concern. (44) . Three years later, the UN adopted the Universal Declaration of Human Rights. (45) . Later, groups like Amnesty International were formed to keep an eye out for human rights abuses wherever they occur.Most nations in the world today would agree that human beings have basic rights. Of course, different countries have different perspectives about the issue. (46) .（分数：77.00）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
