1、大学英语六级模拟试卷 142 及答案与解析 一、 Part I Writing (30 minutes) 1 Should Class Attendance Be Optional 1描述现在大学课堂及讲座上常见的现象：态度不认真，睡觉，发短信及出勤率低 因此提出大学课堂是否应该采取自愿而非强制 2列举原因 3我的看法 二、 Part II Reading Comprehension (Skimming and Scanning) (15 minutes) Directions: In this part, you will have 15 minutes to go over the pas
2、sage 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 statement contradicts the information given in the passage; NG (for NOT GIVEN) if the information is not given in t
3、he passage. 2 The Wonderful World of Small Theres a quiet revolution going on, and its name is nanotechnology. A host of innovations are coming our way. Some seem almost magical, like the new material created in 2004 by Ray Baughman, a professor at the University of Texas. Its stronger than steel, t
4、ransparent, very, very light. A hectare-size sheet would weigh just 280 grams. When the professor announced that he hadnt decided what to call it, he started to get emails from around the world suggesting names. Since it was so light and strong, people started calling it “mithril“ the name of a high
5、ly prized type of armor used in The Lord of Rings. There are other discoveries too perhaps not so astounding, but practical and pleasant. Now there are socks that dont get smelly, pants that resist stains, windows that repel dirt and toilets that clean themselves. All this results from exploring the
6、 world of the very, very small. Nano comes from the Greek word from dwarf. Usually nanotechnology is defined as the study and manipulation of matter smaller than 100 nanometers (纳米 ) thats the scale of things like molecules and viruses. Ten hydrogen atoms pressed together against each other are just
7、 one nanometer long. And one million nanometers fit into a millimeter. Hard to grasp? Think of it this way: If everyone in Manila were a nanometer wide, the entire population, standing shoulder to shoulder, would fit on your thumbnail. Stunning Uses of Nanotechnology Like Alice in Wonderland, resear
8、chers in Nanoland find themselves in a world where old rules dont apply. Small things behave differently. This is behind several innovations, including the self-cleaning toilet. The toilet bowl is sealed with a super-smooth glaze (涂层 ) that has microscopic holes under 30 nanometers. Because theyre s
9、maller than bacteria or other tiny particles, theres not enough room for dirt to get stuck in the surface. Flushing is basically all the work you have to do. Researchers in Nanoland are also making really, really small things with astonishing properties like the carbon nanotube. Chris Papadopoulos o
10、f the University of Victoria, says, “The carbon nanotube is the poster boy for nanotechnology.“ In your pencil, carbon, in the form of graphite (石墨 ), is soft and easily broken. But a carbon nanotube is tough as nails much tougher in fact. Its very thin sheet graphite thats formed into a tube. These
11、 tiny straw-like cylinders, which can be as small as half a nanometer wide, are up to 100 times stronger than steel and six times lighter. They are the hardest, stiffest, strongest materials known and are among the worlds best conductors of heat and electricity. They can carry some 1,000 times more
12、electricity current than copper wire: Everybody wants them, but until now theyve been in short supply and pricey. The current annual production, worldwide, is only 300 kilograms. At 860 a gram, carbon nanotubes cost 50 times more than gold. When it comes to finding uses for carbon nanotubes, the ran
13、ge is huge. The National Research Council Canada (NRC) is looking at harnessing their strength by embedding them in construction materials, among other applications. The Boeing Company thinks nanotubes may be the source of futute improvements for high-performance aircraft. Some of the most stunning
14、uses come out of Ray Baughmans research. Employing what he calls the “ancient technology of spinning“, Baughrnan and his team developed a way of spinning carbon nanotubes into fibers that are four times tougher than spider silk, the toughest natural filament (细丝 ). Since they also conduct electricit
15、y, the futuristic yarns could be woven into “smart“ clothing that stores electricity, is potentially bulletproof and incorporates sensors capable of adjusting the temperature of garment. The fibers could also be made into cables for suspension bridges much longer than any we have now. And then there
16、 are Baughmans superstrong, superlight sheets. Papadopoulos explains that one of the reasons scientists are oxcited by the sheets is that they would make ideal solar sails. He says, “With a solar sail, you are allowing the pressure of the suns light to propel you through space the same way wind powe
17、rs a sailboat.“ But there is also something in this for the earthbound traveler. Using an ordinary microwave oven, Baughmans team was able to weld one of his sheets between two pieces of plexiglass (树脂玻璃 ). Afterwards, it still conducted electricity and remained transparent. One idea, therefore, is
18、to put these sheets in windshields of the car and run current through them to defrost car windows. Medicine and Nanotechnology Many disease-causing bacteria and viruses are nano size. So only nanotechnology would offer us ways of fighting back. Nucryst Pharmaceuticals has come up with a winning form
19、ula that combines nanoscience with old-fashioned folk wisdom. The ancient Greeks used silver to promote healing and prevent infection, but the treatment took a back seat when antibiotics came on the scene. Nucryst has revived and improved on the old cure by coating a burn-and-wound bandage with nano
20、-size silver particles that are more reactive than the bulk form of metal. They penetrate into the skin and work steadily. As a result, burn victims can have their dressings changed as little as once a week. Before Nucryst, such dressings had to be changed several times a day, a painful procedure th
21、at involved removing a healing cream. In 2004, Nucryst produced over three million bandages, and its sales topped 30 million. 70% of chronic-wound patients who were not healing at the expected rate got better with the use of these bandages. Copy Nature with Nanoteehnology With new instruments that r
22、eveal natural structures down to the last atom, nanotechnologists ability to copy nature has taken off. When Bharat Bhushan, a mechanical engineering professor at Ohio State University, wanted to make a super-smooth surface, he decided to copy lotus leaves. Scientists have long known that the leaves
23、 shed water very well: Theyre waxy and covered with tiny nano-size bumps, so water rolls off. Bhushan succeeded in making a polymer (聚合体 ) sheet that was equally smooth. “If you applied it to glass, you could have windows that dont need washing.“ says Bhushan. Hicham Fenniri, a chemistry professor a
24、t the Univeristy of Alberta, took a similar tack to make artificial joints act more like natural ones. The body recognizes an artificial hip or knee as foreign and may reject it. In most cases, the implant can become loose and painful and has to be replaced. But Fenniri has made a nanotube coating f
25、or the artificial joint. Its a very good imitation of collagen (原质 ), a natural protein that is part of bone. As a result, the coating attracts bone cells. This is important because bone growth helps integrate an artificial joint into the body. Says Fenirri, “You need to attract the right cells to t
26、he right places, right away. Speed is essential when incorporating an artificial joint into the body.“(1,146 words) 2 In 2004, Professor Baughman invented a super-strong, super-light magic material and he named it “mithril“ after the precious armor in the popular filmThe Lord of Rings. 3 Nanotechnol
27、ogy has resulted in a wide range of amazing, practical discoveries such as stain-resistant trousers and self-cleaning toilets. 4 Nanotechnology is the study and manipulation of the very small matters such as atoms, molecules and viruses. 5 Self-cleaning toilet bowls, built on the latest nanotechnolo
28、gy, are widely available in North America. 6 As one of the worlds best conductors of electricity, nanotubes can carry about _ than copper wire. 7 The garments made of electricity-storing carbon nanotube fibers are “smart“ in that they are bulletproof and can _ with sensors. 8 Baughmans superstrong,
29、superligh, transparent sheet can be inserted in the windshields to help _ . 9 The burn-and-wound bandages coated with nano-size silver particles are a typical example of _ . 10 According to Prof. Bhushan, we could have stain-resistant window glass by using super-smooth polymer sheets, which are prod
30、uced by _ . 11 The artificial joint with _ , being a good imitation of natural bone protein, can attract bone cells and become quickly incorporated into the body. Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one
31、 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） At a bank. （ B） At a tra
32、vel agency. （ C） At a post office. （ D） At an airport. （ A） This is the first time for the man to wear a tie. （ B） He looks wonderful when he is not wearing a tie. （ C） The design of the tie doesnt look so nice. （ D） This is the first time for the man to choose a tie with this kind of design. （ A） H
33、e lost a button at work. （ B） He doesnt know where he put the calculator. （ C） He thought he broke something the woman lent him. （ D） Hes not sure how to solve the math problem. （ A） The woman is helpful. （ B） The woman is thankful. （ C） The woman is sorry. （ D） The woman is offended. （ A） Because h
34、e wanted to meet the womans parents. （ B） Because he goes to beach house each August. （ C） Because he wont be able to take a vacation. （ D） Because he didnt know the womans plan. （ A） They dont want children for the time being. （ B） They have two children already. （ C） Mrs. Taylor wishes to have chi
35、ldren, but her husband doesnt. （ D） They will start a family as soon as they get married. （ A） A businessman. （ B） A policeman. （ C） A thief. （ D） A waiter. （ A） The program begins on Sunday. （ B） Hell meet the woman on Sunday. （ C） They could watch the program on Sunday. （ D） His cousin arrives on
36、Sunday. （ A） A surgeon general who will be present in a rose garden （ B） A woman who used to be one of Reagans Surgeon General. （ C） A spokesman for President Clinton on drug regulations. （ D） Ronauld Reagan. （ A） Announce for the first time the regulations on tobacco. （ B） Publish the usual protoco
37、ls he has gone through. （ C） Declare pretty much the same restrictions on drug use as in 1995. （ D） Present to the public the revised regulations on tobacco. （ A） President Clinton suggested an end to using trade marks of cigarette on baseball caps. （ B） President Clintons new restriction on tobacco
38、 is basically on teen smokers. （ C） There are some measures going along with advertising ban on cigarettes. （ D） He doesnt think therell ever be an official ban on cigarettes in America. （ A） Maderia was not chosen because its roads were too dangerous. （ B） The Costa Del Sol was finally chosen after
39、 three months of investigation. （ C） Britain was not chosen because it now was forecast for April. （ D） Portugal was not chosen because it was not quiet enough for the press. （ A） At least 60 had been tested on British roads. （ B） 30 were shipped from England to Spain in containers. （ C） About 50 we
40、re transported from the factory to Plymouth. （ D） Only 20 were sent at night by charter flights. （ A） In all, forty technicians were sent to the launch. （ B） Some specialized technicians were sent to prevent accidents. （ C） All the technicians overland were sent to Marblla in six Range Rovers. （ D）
41、About half as many technicians as cars were sent to the launch. （ A） The British regional press. （ B） The foreign press. （ C） The car dealers and their wives. （ D） Correspondents from the British national press. Section B Directions: In this section, you will hear 3 short passages. At the end of eac
42、h 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） Its about 29 hours a week. （ B） Its almost 25 hours a week. （ C） For high school students,
43、 its about 13 hours. （ D） Maybe less than 5 hours. （ A） They think the screen is a map of the world. （ B） They see the screen like a painting. （ C） They see the screen like a photograph. （ D） They consider what happens on television as a real life. （ A） Children are willing to accept the real violen
44、ce in society. （ B） Children will become more and more kind. （ C） Children will not accept the violence in society. （ D） Children think they are just imaginary. （ A） It talks about communication, which is ferry, in San Francisco. （ B） The bridge joins San Francisco with suburbs to the north. （ C） Th
45、e bridge is not so well built that nobody likes it. （ D） It describes the bridge so beautiful that people like it. （ A） Boats take commuters from the suburbs to the city. （ B） The trip to work on the bridge is not pleasant. （ C） The Golden Gate Bridge. （ D） Plans are being made for the future of the
46、 ferry. （ A） Half an hour. （ B） Fifteen minutes. （ C） Twenty minutes. （ D） One hour. （ A） They want to show their differences from others. （ B） They want to be remembered as a master. （ C） They want understanding from the public. （ D） They want the public to learn from them. （ A） He thinks they are
47、beautiful. （ B） He believes they can bring delight to him. （ C） He thinks they are worth showing to the public. （ D） He believes they are particular. （ A） Both convey the same meaning. （ B） Both show certain aspects of the world. （ C） The latter is more meaningful. （ D） The former is more meaningful
48、. （ A） The public could share the artists feelings through their paintings. （ B） The painter should not choose to paint ugly things. （ C） Contemporary artists are completely different from other artists. （ D） All artists are teaching the public consciously. Section C Directions: In this section, you
49、 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 exact words you have just heard. For blanks numbered from 44 to 46 you are required to fill in the missing information. For these blanks, you can either use the exact words you have just heard or write d
