1、大学英语六级模拟试卷 270及答案与解析 一、 Part I Writing (30 minutes) 1 Directions: For this part, you are allowed 30 minutes to write a composition on the title: Should Class Attendance Be Optional? You should write at least 150 words following the outline given below in Chinese. 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
2、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。 Should Class Attendance Be Optional 二、 Part II Reading Comprehension (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
3、： 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 the passage. 1 The Wonderful World of Small Theres a quiet revolution going on, and its
4、 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, transparent, very, very light. A hectare-size sheet would weigh just 280 grams. When th
5、e 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 highly prized type of armor used in The Lord of Rings. There are other discoveries too-per
6、haps 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 world of the very, very small. Nano comes from the Greek word from dwarf. Usually nan
7、otechnology is defined as the study and manipulation of matter smaller than 100 nanometers(毫微米 )-thats the scale of things like molecules and viruses. Ten hydrogen atoms pressed together against each other are just one nanometer long. And one million nanometers fit into a millimeter. Hard to grasp?
8、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, researchers in Nanoland find themselves in a world where old rules dont apply. Small things
9、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 smaller than bacteria or other tiny particles, theres not enough room for dirt to get s
10、tuck 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 of the University of Victoria, says, “The carbon nanotube is the poster boy for nanotec
11、hnology.“ 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 tiny straw-like cylinders, which can be as small as half a nanometer wide, are up to
12、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 1000 times more electricity current than copper wire. Everybody wants them, but until now theyve been i
13、n 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 range is huge. The National Research Council Canada (NRC) is looking at harnessing their
14、 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 uses come out of Ray Baughmans research. Employing what he calls the “ancient technol
15、ogy of spinning,“ Baughman 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 electricity, the futuristic yarns could be woven into “smart“ clothing that stores electricity,
16、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 are Baughmans superstrong, superlight sheets. Papadopoulos explains that one of the r
17、easons scientists are excited 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 powers a sailboat.“ But there is also something in this for the earthbound traveler. Using
18、 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 to put these sheets in windshields of the car and run current through them to defrost
19、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 formula that combines nanoscience with old-fashioned folk wisdom. The ancient Greeks used
20、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-size silver particles that are more reactive than the bulk form of metal. They penetr
21、ate 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 that involved removing a healing cream. In 2004, Nucryst produced over three million ban
22、dages, and its sales topped $ 30 million. 7O% of chronic-wound patients who were not healing at the expected rate got better with the use of these bandages. Copy Nature with Nanotechnology With new instruments that reveal natural structures down to the last atom, nanotechnologists ability to copy na
23、ture 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 shed water very well: Theyre waxy and covered with tiny nano-size bumps, so water r
24、olls 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 at the Univeristy of Alberta, took a similar tack to make artificial joints act more
25、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 for the artificial joint. Its a very good imitation of collagen (胶原质 ), a natural pro
26、tein 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, “Yon need to attract the right cells to the right places, right away. Speed is essential when incorporating an artificial jo
27、int into the body.“ 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 film The Lord of Rings. （ A） Y （ B） N （ C） NG 3 Nanotechnology has resulted in a wide range of amazing, practical discoveries such a
28、s stain- resistant trousers and self-cleaning toilets. （ A） Y （ B） N （ C） NG 4 Nanotechnology is the study and manipulation of the very small matters such as atoms, molecules and viruses. （ A） Y （ B） N （ C） NG 5 Self-cleaning toilet bowls, built on the latest nanotechnology, are widely available in
29、North America. （ A） Y （ B） N （ C） NG 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, superl
30、igh, 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 produced by
31、 _. 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 or more qu
32、estions 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） He is working especially hard on ph
33、ysics. （ B） He is surprised why Johnson did not fail. （ C） He wants to pass the history course, too. （ D） He wonders how Johnsons history come was going on. （ A） The man will probably go to Canada fur his vacation. （ B） The man will probably wait until summer to go to Australia. （ C） The man will pr
34、obably not go to Canada for his vocation. （ D） The man will probably stay at home during his winter vocation. （ A） In a hotel room. （ B） In the railway station. （ C） In the post office. （ D） In a bus terminal. （ A） He wants to be invited to a concert. （ B） He told them what his favorite hobbies are.
35、 （ C） He doesnt really enjoy classical music. （ D） He doesnt know much about classical music. （ A） She could meet her boy friend. （ B） The working place is inconvenient for her. （ C） Shes looking forward to a different job. （ D） She refused the position bemuse of the low salary. （ A） No, because he
36、is an undergraduate. （ B） No, because its open only to teachers. （ C） Yes, if hes a written permission. D. Yes, because he is a postgraduate. （ A） They are very rewarding. （ B） They give her too much trouble. （ C） The teacher is too strict. （ D） She doesnt like the lessons because they take too much
37、 time （ A） The woman is asking for a promotion. （ B） The woman is being interviewed by a reporter. （ C） The woman wants to get some information. （ D） The woman is applying for a job. （ A） To go to the school cafeteria. （ B） To go to the food stands outside the school （ C） To go to the supermarket. （
38、 D） To go to the venders （ A） The food served at the stands is tasty and healthy. （ B） The food the supermarket sells attracts the attention of the students. （ C） Students think the service in the school cafeteria is not good enough. （ D） Students got sick after they had a meal m the school cafeteri
39、a. （ A） He believes it does one much good. （ B） He tells her its his treat （ C） He suggests that she have it every night. （ D） He thinks it is healthy to her. （ A） About how to fill in the university application forms. （ B） About how to prepare for TOEFL. （ C） About the requirements for post-graduat
40、e programs. （ D） About tuition in Canadian universities. （ A） GMAT and TOEFL. （ B） GRE and TOEFL or IELTS. （ C） GMAT and IELTS （ D） GRE and GMAT. （ A） In July or August. （ B） In September or October. （ C） In October or November. （ D） in November or December. （ A） International students. （ B） Wealthy
41、 students. （ C） Mechanical engineering students. （ D） The top 5 students entering the program. Section B Directions: In this section, 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
42、a question, you must choose the best answer from the four choices marked A, B, C and D. （ A） Someone who has received more education. （ B） Someone who has better quality than any of as. （ C） Someone who has invented a great many new products. （ D） Someone who has the gift ordinary people do not have
43、. （ A） ones creativity needs stimulating by the others. （ B） Most peoples creativity is weak and rare. （ C） All individuals have the ability of creativity. （ D） Creativity is something only a few people have. （ A） Adventurous parents. （ B） Stimulating environment. （ C） Sensitive teachers. （ D） Furth
44、er education. （ A） Intelligent life. （ B） Canals of some kind. （ C） Signs of life. （ D） Natural resources. （ A） To send more spacecraft. （ B） To receive radio signals. （ C） To use modem telescopes. （ D） To welcome men From outer space. （ A） There may exist some intelligent life. （ B） There isnt any
45、intelligent life. （ C） There may exist some living things. （ D） There may even be no living things. （ A） The smell of men with genes totally similar to their own （ B） The smell of men whose genes are similar to the womens fathers （ C） The smell of men whose genes are similar to the womens mothers （
46、D） a common smell （ A） Men and women were equally good at identifying smells （ B） Girls were better at identifying smells than women （ C） Old women were better at identifying smells than women （ D） Women could be better in recognizing smells by smelling them repeatedly （ A） It is said that they am m
47、ore careful with smells. （ B） It is reported that they are more sentimental. （ C） It seems to be connected with hormones produced by women. （ D） It is linked with the substances in the T-shirts. （ A） Findings of two studies （ B） Understanding of women and their sense of smell （ C） Smell and gene （ D
48、） Smell experiments Section C Directions: In this section, you 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 w
49、ith 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 down the 34 LOS ANGELES Hong Kong immigrants living in the American city known as the “Chinese Beverly Hills“ are【 B1】 _ . because they face losing a lucky phone number 818, or prosperity followed by more prosperity. Many people living i
