大学四级-1876及答案解析.doc

1、大学四级-1876 及答案解析(总分：710.00，做题时间：90 分钟)一、Part Writing(总题数：1，分数：106.50)1.Directions: For this part, you are allowed 30 minutes to write about your views on Internet as a learning resource. You should write at least 120 words following the outline given below in Chinese.My View on Internet As a Learning

2、 Resource1互联网上的学习资源日益丰富2大学生将互联网作为学习平台的利弊之争3如何扬长避短（分数：106.50）_二、Part Listening Com(总题数：0，分数：0.00)三、Section A(总题数：4，分数：106.50)(1).A. In a phone booth. B. In a friends house.C. At home. D. In her office.（分数：7.10）A.B.C.D.(2).A. He was the only person who helped.B. He shouldnt have helped.C. He was well-

3、intentioned.D. He finds it hard to paint the fence.（分数：7.10）A.B.C.D.(3).A. He doesnt enjoy apple juice.B. He had a car crash this morning.C. He drank up the whole quarter of juice.D. He broke the container of the apple juice.（分数：7.10）A.B.C.D.(4).A. $39. B. $33. C. $30. D. $29.（分数：7.10）A.B.C.D.(5).A.

4、 In front of the check-in. B. At the departure gate.C. In a ship. D. On a plane.（分数：7.10）A.B.C.D.(1).A. The test was harder than she had expected.B. She was satisfied with her test performance.C. She was lucky to pass the test.D. The test was as challenging as she had expected.（分数：7.10）A.B.C.D.(2).A

5、 To tell him they are going to a concert.B. To tell him when the concert begins.C. To invite him to go to a concert.D. To tell him they are too busy to go to concert with him.（分数：7.10）A.B.C.D.(3).A. Customer and salesman. B. Classmates.C. Co-workers. D. Phone operator and salesman.（分数：7.10）A.B.C.D.

6、1).A. Childrens education. B. Cultural programs in school.C. School board election. D. School budget.（分数：7.10）A.B.C.D.(2).A. Disapproving. B. Supportive.C. Indifferent. D. Sympathetic.（分数：7.10）A.B.C.D.(3).A. The cultural programs will be cut.B. The tax will be raised.C. She might be beat by Carter

7、Boswell.D. Carter Boswell might fail to keeps his promise.（分数：7.10）A.B.C.D.(4).A. To complain to the school headmaster.B. To seek help from other parents.C. To persuade Boswell to change his mind.D. To run for the school board as Boswells rival.（分数：7.10）A.B.C.D.(1).A. To go to the grocery store befo

8、re it closes.B. To carry her groceries home.C. To move to a new place.D. To get a ride home with James.（分数：7.10）A.B.C.D.(2).A. To take care of their pets when they are on vacation.B. To organize a welcome party when they are back form vacation.C. To see them off at the airport.D. To do some shopping

9、 for them while they are away from home.（分数：7.10）A.B.C.D.(3).A. They took her on a vacation with them.B. Theyre pay for her education.C. They invited her to their party.D. They let her live with them rent-free.（分数：7.10）A.B.C.D.四、Section B(总题数：0，分数：0.00)五、Passage One(总题数：1，分数：28.40)(1).A. Whether its

10、 necessary to place labels on foods.B. What the daily requirements for certain nutrients should be.C. What information food manufacturers should provide to consumers.D. How to get consumers to read labels more carefully.（分数：7.10）A.B.C.D.(2).A. To explain that current consumers tend to be more curiou

11、s.B. To indicate that most consumers research the products they buy.C. To compare current consumer trends with those of the past.D. To show that has been a decrease in consumer awareness.（分数：7.10）A.B.C.D.(3).A. Stricter quality standards for prepared foods.B. Regular inspection of food products.C. R

12、easonable pricing of food products.D. More detailed labels on food.（分数：7.10）A.B.C.D.(4).A. They were not able to comprehend a label without percentages.B. They preferred more attractive labels.C. They were more willing to read simple, concise labels.D. They thought the description on labels was too

13、technical.（分数：7.10）A.B.C.D.六、Passage Two(总题数：1，分数：21.30)(1).A. Enthusiastic. B. Disapproving.C. Objective. D. Supportive.（分数：7.10）A.B.C.D.(2).A. It is much more dangerous than any other sports.B. It takes much shorter time to get excitement.C. It is harder to find a proper place for it.D. It costs m

14、uch more to organize it.（分数：7.10）A.B.C.D.(3).A. They want to escape from modern life.B. They have more free time and money.C. They want to maintain an adventurous spirit.D. They are searching for excitement.（分数：7.10）A.B.C.D.七、Passage Three(总题数：1，分数：21.30)(1).A. Leaves that have an offensive taste.B.

15、 Leaves that have turned brown.C. Leaves that smell awful.D. Leaves that bees find disgusting.（分数：7.10）A.B.C.D.(2).A. By waving their branches.B. By giving off a special vapor.C. By changing the color of its leaves.D. By changing the chemistry of its trunk.（分数：7.10）A.B.C.D.(3).A. It seems perfectly

16、reasonable.B. It is unbelievable.C. It is more complicated than the communication system among bees.D. It is as interesting as human communication.（分数：7.10）A.B.C.D.八、Section C(总题数：1，分数：71.00)Can time travel really be done? Physicists think that travel into future is possible. Einsteins special theor

17、y of (26) , published in 1905, predicted that time should be elastic (弹性的), (27) as an observer moves. To get a really big time leap it is necessary to travel at near the speed of light300,000 km per second. At 99% of this speed, (28) a distant star and back would take 15 months, but travelers would

18、 return home to find that nearly nine years had passed on Earth. (29) , you would have leapt several years into Earths future.Gravity offers another way to slow time. On the Earths (30) , clocks tick a little slower than on the moon, for example. Near a black hole, gravity is so (31) that time is sl

19、owed to a crawl relative to us. These facts are accepted by almost all scientists. Traveling forwards in time has been (32) convincingly in experiments, but the possibility of traveling backwards in time is far more (33) .Worm holes are similar to black holes, but there exists a key difference. Wher

20、eas black holes offer a one-way journey to nowherefall in and you never get outworm holes have (34) . Scientists at California Institute of Technology found that if you tried to make a worm hole out of any normal form of matter, it would (35) under its own gravity and turn into a black hole. For a w

21、orm hole to remain stable, it would have to be made of exotic material that would create an anti-gravity force.（分数：71.00）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:_九、Part Reading Compr(总题数：0，分数：0.00)十、Section A(总题数：1，分数：35.50)For most of the 20th century, there has been li

22、fe on Mars. Or, at least in the minds of the Earthlings, who live on its closest planetary neighbor. But could life exist on Mars, given that it is a very (36) world from what it was 3.8 billion years ago? It has (37) no atmosphere. It has a barren surface, which is bathed in ultraviolet (38) from t

23、he Sun, and there is no liquid water on the surface of the planet (although there are ice caps at its poles. ) Mars had moved from a warm, wet placea likely home for lifeto a dead world of dust storms, (39) and vast canyons. It happened because its carbon dioxide atmosphere could not remain (40) in

24、a wet environment. Carbon dioxide reacted with rocks, and it was rapidly absorbed by water, where it became solid carbonates (碳酸盐) and (41) to the bottom of seas. It is a greenhouse gas, which (42) heat from the Sun. As it disappeared from the Martian atmosphere, the Planet began to cool. Its atmosp

25、here grew thinner and all the water on the surface (43) . This is a fate that the Earth escaped because of water vapor and other greenhouse gases, which are (44) present in its atmosphere.And this not necessarily the end of the story. Mars could one day be a warm, wet world again, if sufficient gree

26、nhouse gases were (45) into the atmospherea task our descendents may one day set themselves when they begin to colonize the solar system.A. frozeB. differentC. steadyD. trapsE. volcanoesF. adequateG. stableH. releasedI. radiationJ. distinguishedK. virtuallyL. earthquakesM. sankN. constantlyO. confin

27、es（分数：35.50）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:_十一、Section B(总题数：1，分数：71.00)Plastic Bag PollutionA Plastic bags are difficult and costly to recycle and most end up on landfill sites where they take around 300 years to decay. They break down into tiny toxic (有毒的) par

28、ticles that pollute the soil and waterways and enter the food chain when animals accidentally consume them. But the problems surrounding waste plastic bags start long before they decay. Our planet is becoming increasingly endangered by our over-use of plastic bags.B Plastic bags are made from ethyle

29、ne (乙烯), a gas that is produced as a by-product of oil, gas and coal production. Ethylene is made into polymers (聚合体)-chains of ethylene molecules-called polyethylene. This substance, also known as polythene, is used to produce a range of items, including plastic bags. You have probably noticed two

30、types of plastic shopping bags-the lighter, filmy bags you get from supermarkets and food outlets, and the heavier bags from other retail outlets, like clothing stores. The supermarket bags are made from high density polyethylene (HDPE), while the thicker bags are made from low density polyethylene

31、LDPE). Unlike HDPE, LDPE can not be recycled.C While plastic bags may not be the most high tech application of plastics technology, it is certainly one of the most prevalent. The use of plastic bags has increased at an alarming rate since they became popular in the 1980s. According to Clean Up Aust

32、ralia, Australians use in excess of 6 billion plastic bags per year. If tied together these bags would form a chain that is long enough to go around the world 37 times. More than half of these bags (3.6 billion) are made from HDPE. Big black bin liners, plastic carrier bags carrying advertising logo

33、s, clear sandwich bags and a variety of other forms. Theyre lightweight, handy and easily discarded. Too easily discarded. Just take a look around you. Plastic bags can be seen hanging from the branches, flying in the air, settled amongst bushes and floating on rivers. They block up drains causing w

34、ater and sewage to overflow and become the breeding grounds of bacteria that cause diseases.D Plastic bags are now amongst the top 12 items of wastes most often found along the coastlines. Sea creatures are hurt and killed every day by discarded plastic bags-a dead turtle with a plastic bag hanging

35、from its mouth isnt a pleasant sight but mistaking plastic bags for food is commonplace amongst marine animals. Plastic blocks their intestines (肠道) and leads to slow starvation. Others become entangled in plastic bags and drown.E Because plastic bags take hundreds of years to break down, every year

36、 our seas become home to more and more bags that find their way there through our sewers and waterways. Every bag thats washed down a drain during rainfall ends up in the sea; every bag thats flushed down a toilet ends up in the sea; every bag thats blown into a river will most likely end up in the

37、sea. One disquieting fact stemming from this is that plastic bags can become serial killers. Once an animal dies of plastic bags, it decays at a much faster rate than the bag. Once the animal has decomposed, the bag is released back into the environment more or less intact, ready to be eaten by anot

38、her misguided organism. The incredibly slow rate of decay of plastic bags also means that each bag we use compounds the problem, because the bags simply accumulate.F Different countries have adopted a range of approaches to discourage the use of plastic bags in an attempt to cut down on the number o

39、f bags finding their way into the environment. In South Africa for instance, where an estimated eight billion plastic bags are used annually, the government has implemented new regulations that will see only thicker, more durable plastic bags produced. As well as making them more suitable for reuse,

40、 it is hoped that the extra cost associated with their production and supply will prevent retailers giving the higher quality bags away, making their use a more expensive option for consumers.G The use of plastic bags is being discouraged in other countries such as Singapore and Taiwan, while the ta

41、x imposed on the use of plastic shopping bags in Ireland has resulted in the use of plastic shopping bags being reduced by 90% in just six months. Prior to the 15 euro cent per bag tax, it was estimated that 1.2 million plastic shopping bags were being handed out in Ireland per year. The money raise

42、d from the tax will be used to fund environmental initiatives. While anything that lowers our consumption is good, why wait until were hit financially before we change our habits when changes arent difficult to make?H Some countries have introduced so-called “environmentally friendly plastic bags“ t

43、hat are biodegradable (可生物降解). These bags take about three years to break down into practically nothing and while that sounds like an attractive solution, the truth is that the process of breaking down these petrol based bags causes carbon to become methane (甲烷) which is a greenhouse gas. Its also p

44、ossible to get “plastic“ bags manufactured from corn. These break down very quickly and give off no more methane than any other corn product on landfill sites. Unfortunately, theyre more expensive to produce and few shops use them.I One question thats often raised in connection with the plastic bag

45、dilemma is what should be used to line bins if not plastic bags? To answer that, lets go back in time to when plastic bags were yet to become commonplace. What did we do? For one, we had far less garbage. Goods had much less packaging than is the case today so we didnt fill our bins as quickly. Peel

46、ings, eggshells, tea bags and coffee grounds were all used as compost (肥料) for crops, as was any paper that wasnt needed for lighting fires. What was left went into an unlined bin with anything dirty or wet being wrapped in newspaper first. If we choose carefully when shopping so as not to bring hom

47、e more packaging than necessary-theres really no point in bringing it home just to throw it straight in the bin when we unpack, the amount of waste that goes into the kitchen bin will be halved, at least.J By refusing to use plastic bags, you can make a huge difference to the pollution problem. Reme

48、mber that each person uses about 83 bags a year. If there are four people in your family, thats 332 plastic bags less every year. Thats 332 bags less that will release toxins into the ground water from landfill sites, stay in the environment for hundreds of years, get into the food chain through animals, waste energy during the manufacturing process, and kill any of the estimated 100,000 marine animals th