[外语类试卷]大学英语六级模拟试卷275及答案与解析.doc

1、大学英语六级模拟试卷 275及答案与解析 一、 Part I Writing (30 minutes) 1 Directions: For this part, you are allowed thirty minutes to write a composition on the topic Should Euthanasia be legalized? You should write at least 150 words according to the outline given below in Chinese. 1. 有不少绝症病人和病人的家属认为安乐死应该合法化。 2但是也有不少

2、人不同意把安乐死合法化。 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 passage quickly and answer the questions attached to the passage. For questions 1-4, mark： Y (for YES) if the statement agrees with the informat

3、ion 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 Creatures of the Thermal (热量的 ) Vents The three-person submersible Alvin sank through the cold, dark waters of the Pacific Ocea

4、n for more than an hour, finally touching down on the sea floor more than 8,000 feet below the surface. It was December 1993, and the scientists inside the sub had come to thisstretch of the East Pacific Rise, an underwater mountain range about 500 miles southwest of Acapulco, Mexico, to inspect a r

5、ecently formed hydrothermal vent-a fissure(裂缝 ) in the ocean bottom that leaks boiling, acidic water. Peering out through the subs tiny windows, the visitors were astonished to see thickets of giant tube worms, some four feet tall. The tail ends of the worms were firmly planted on the ocean floor, w

6、hile red plumes on the other ends swayed like a field of poppies. Alvin had brought researches to the same spot less than two years earlier, when they had seen none of these strange creatures. Previous measurements showed that individual tube worms could increase in length at a rate of 33 inches per

7、 year, making them the fastest-growing marine invertebrates. That means tube worms can grow more rapidly than scientists once thought. The giant tube worm is one of the most eye-catching members of a diverse community that forms around hydrothermal vents. Scientists once thought that no living thing

8、 could survive the harsh combination of toxic chemicals, high temperatures, high pressures, and total darkness at these vents. But in 1977, researchers diving in Alvin discovered tube worms and other strange organisms thriving at a Vent off the Galapagos Islands. Similar communities have since been

9、found at several hundred hot sots around the world. These creatures are like nothing else on Earth. Vents form where the planets crustal plates are slowly spreading apart and magma is welling up from below to form mountain ranges known as mid-ocean ridges. As cracks form at these spreading centers,

10、seawater seeps a mile or two down into the hot rock. Enriched with minerals leached from the rock, the water heats and rises to the ocean floor to form a vent. Vents are usually clustered in fields, underwater versions of Yellowstones geyser basins. Individual vent openings typically range from less

11、 than a half inch to more than six feet in diameter. Such fields are normally found at a depth of more than a mile. Most have been discovered along the crest of the Mid-Oceanic Ridge, a 46,000-mile-long chain of mountains that wraps around Earth like the seams on a baseball. A few vents have also be

12、en found at seamounts, underwater volcanoes that are not located at the intersection of crustal plates. Hydrothermal vents are underwater oases (避风港 ), providing habitat for many creatures that are not found anywhere else in the ocean. Water pouring out of vents can reach temperatures up to about 40

13、0 ; the high pressure keeps the water from boiling. However, the intense heat is limited to a small area. Within less than an inch of the vent opening, the water temperature drops to 2 , the ambient temperature of deep seawater. Most of the creatures that assemble around vents live at temperatures j

14、ust above freezing. Thus, chemicals are the key to vent life, not heat. The most prevalent chemical dissolved in vent water is hydrogen sulfide (硫化氢 ), which smells like rotten eggs. This chemical is produced when seawater reacts with sulfate (硫酸盐 ) in the rocks below the ocean floor. Vent bacteria

15、use hydrogen sulfide as their energy source instead of sunlight. The bacteria in turn sustain large organisms in the vent community. The clams, mussels, tube worms, and other creatures at the vent have a symbiotic relationship (共生关系 ) with bacteria. The giant tube worms, for example, have no digesti

16、ve system-no mouth or gut. The worm depends virtually solely on the bacteria for its nutrition and both partners benefit. The brown, spongy tissue filling the inside of a tube worm is packed with bacteria about 285 billion bacteria per ounce of tissue. The plumes at the top of the worms body are red

17、 because they are filled with blood, which contains hemoglobin that binds hydrogen sulfide and transports it to the bacteria housed inside the worm. In return, the bacteria oxidize the hydrogen sulfide and convert carbon dioxide into carbon compounds that nourish the worm. Tube worms reproduce by sp

18、awning (产卵 ). They release sperm (精子 ) and eggs, which combine in the water to create a new worm. Biologists dont know how the infant worm acquires its own bacteria. Perhaps the egg comes with a starter set. Scientists also dont know how tube worms and other organisms locate new vents for colonizati

19、on. The vents are small, and they are separated like islands. Most vent organisms have a free-swimming larval stage (幼虫期 ). But scientists arent sure whether the larvae float aimlessly or purposely follow clues such as chemical traces in the water-to find new homes. Studying the life cycle of vent o

20、rganisms is difficult. Researchers have visited only a fraction of the oceans hot spots. They have been able to observe vent life only by shining bright lights on creatures accustomed to in inky darkness, and many samples die quickly when removed from their unique environment. Underwater cameras are

21、 helping scientists make less interfering observations, but diving expeditions are still the most useful way to gather information. The 1993 Alvin expedition to the East Pacific Rise was one in a series of dives to the area. The site was first visited in 1989, and scientists observed vent organisms

22、thriving there. But when Alvin returned two years later, its flabbergasted occupants witnessed the birth of a hydrothermal vent. A recent volcanic eruption spread glassy lava across the ocean floor, and the researchers measured temperatures up to 403 the hottest ever recorded at a hydrothermal vent.

23、 The scientists dubbed the site Tube Worm Barbecue, because the worms they brought back to their ship had burned flesh. “The most spectacular sight down there was this massive blinding snowstorm of bacteria,“ says Rich Lutz, a marine ecologist at Rutgers University, who led the expedition. On the oc

24、ean floor, the bacteria formed mats several inches thick, but he scientists saw no other living things. Since the eruption, scientists have been able to watch several stages of colonization at the site. When they returned in March 1992, only a few bacterial mats remained. In their place were colonie

25、s of Jericho worms and a variety of small crustaceans. In December 1993, the scientists first observed the giant tube worms there. The scientists named the area Phoenix, because new life had arisen from the ashes of the eruption. 2 No living thing could survive at a vent except tube worms. （ A） Y （

26、B） N （ C） NG 3 Usually tube worms live in high-temperature environment. （ A） Y （ B） N （ C） NG 4 The bacteria depend on worms for hydrogen sulfide in the symbiotic relationship. （ A） Y （ B） N （ C） NG 5 Vent life dies quickly when exposed to light. （ A） Y （ B） N （ C） NG 6 Hydrothermal vents are formed

27、 by _. 7 Scientists in Alvin were surprised in 1993 because they thought that those giant tube worms would be less than _ inches at that time. 8 Thanks to_, water beyond 100 could not boil. 9 It is _ that attract vent life. 10 According to the passage, tube worms live on _. 11 In year _, there were

28、many dead tube worms found in the East Pacific Rise according to the information from the expeditions. 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 questions will be asked about what was said. Both t

29、he 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） She is not to blame. （ B） She will accept the responsibility. （ C） It was her fault.

30、 （ D） She will be more careful next time. （ A） She is scornful. （ B） She is sympathetic. （ C） She is angry. （ D） Shes disappointed. （ A） She likes the job of a cleaner because its simple. （ B） She thinks its important to have a good job from the beginning. （ C） She hates to be a cleaner because its

31、low-paid. （ D） She would work as a cleaner in summer if she has to. （ A） She has to resign from the company for her poor sales performance. （ B） She has been granted leave for a month. （ C） She has been dismissed by the company. （ D） She has been offered a new job. （ A） Public means of transportatio

32、n are much faster and cheaper. （ B） The man thinks going by subway is much safer than by taxi. （ C） Parking is becoming a big problem. （ D） The woman doesnt agree with the man. （ A） It failed for lack of funds. （ B） It ended up fairly successful. （ C） It was suspended for the land dispute. （ D） It w

33、as difficult to complete and had to be stopped. （ A） Go out with the man for lunch. （ B） Share her yogurt with the man. （ C） Have a sandwich for lunch. （ D） Eat what she brought with. （ A） Itll cost him a lot of money. （ B） He isnt serious about going. （ C） Other people will pay for his air-fare and

34、 supplies. （ D） He is excited and cant wait to go. （ A） Collecting objects on the beach. （ B） Creating models of different shapes. （ C） Mapping currents in the ocean. （ D） Tracking water pollution. （ A） An interesting piece of wood. （ B） A bottle with a message inside. （ C） A pair of sneakers. （ D）

35、A piece of modern sculpture. （ A） A storm can hardly change the direction of an ocean current. （ B） The loss of sneakers in the storm put the company in the financial difficulty. （ C） Not all useful experiments are planned ahead of time. （ D） Computers cannot always predict the effects of ocean stor

36、ms. （ A） He worked as a sales-assistant in a clothing shop. （ B） He was the manager of a clothing shop. （ C） He worked in a laundry. （ D） He. was a lifeguard in a swimming pool. （ A） She had four months free before she went to college. （ B） Her working place was near where she lived. （ C） She was un

37、qualified for anything. （ D） She needed the money. （ A） They were all above thirty years old. （ B） All the workmates were tough to her. （ C） The oldest workmate was kind to her. （ D） She got along quite well with all the workmates. （ A） She washed nurses aprons and surgeons caps. （ B） She pressed su

38、rgeons caps and nurses aprons. （ C） She folded surgeons caps and nurses aprons into knife-edged creases. （ D） She steamed the clothes of the surgeons and nurses. 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

39、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） To help children to gut academic achievements. （ B） To offer children what they need to get a promotion. （ C） To equip children with social

40、skills. （ D） To enable children to participate in extracurricular activities. （ A） Fostering a healthy attitude in boys and girls. （ B） Giving children opportunity to make friends. （ C） Preparing children for the shock in adult society. （ D） Making children understand the aim of education. （ A） Chil

41、dren are unfamiliar with each others problems. （ B） Children are deprived of the opportunity to enter the adult world. （ C） There are too many segregated schools. （ D） Boys and girls do not study together and fail to know each other. （ A） Because students need individual attention. （ B） Because stud

42、ents need to be stimulated. （ C） Because students need exactly the same instruction. （ D） Because students dont know how to learn. （ A） A practical knowledge of how the language works. （ B） A genuine interest in the language and thinking by themselves. （ C） Curiosity and conscious knowledge. （ D） In

43、dependent thinking. （ A） Students learn by memorizing textbooks. （ B） Teachers teach by reciting lectures. （ C） Students should ask questions based on their own thinking. （ D） The linguistic knowledge is more important for teachers than the techniques of stimulating interest. （ A） They extend their

44、water pipes. （ B） They give out faint cries. （ C） They make noises to drive insects away. （ D） They become as elastic as rubber bands. （ A） Healthy plants. （ B） Quiet plants. （ C） Well-watered plants. （ D） Thirsty plants. （ A） They can buzz in to kill. （ B） They can hear the dry plants cries. （ C） T

45、hey can imitate the plants crying. （ D） They can attack healthy plants in dry, hot weather. （ A） They could drive the insects away. （ B） They could keep the plants well-watered. （ C） They could build devices to trap insects. （ D） They could protect the plants from severe droughts. Section C Directio

46、ns: 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 with the exact words you have just hear

47、d. 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 36 Perhaps only a little boy being trained to be a wizard at the Hogwards school magic could cast a spell so powerful a

48、s to create the biggest book launch ever. Wherever in the world the clock strikes midnight on June 20th, his followers will【 B1】 _ to get their paws on one copy of Harry Potter and the Order of the Phoenix. Bookshops will open in the middle of the night and【 B2】 _ firms are drafting in extra staff a

49、nd bigger trucks. Related toys, games, DVDs and other merchandise will be everywhere. There will be no【 B3】 _ Potter- mania. While an【 B4】 _ media is helping hype (宣传 ) the launch of Rowlings the fifth novel, about the most【 B5】 _ thing that publishers have organized is a reading by Ms. Rowling in Londons Royal Albert Hall, to be broadcast as a live web cast.【 B6】_ as it may seem, the guardians of the brand say that, to protect the Potter franchise (特权 )