1、大学英语六级模拟试卷 651 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 short essay entitled The Advantages and Disadvantages of Going Abroad for Holidays. You should write at least 150 words following the outline given below: - 出国旅游悄然兴起 - 出国旅游的种种好处 -
2、出国旅游的种种弊端 - 你的选择 The Advantages and Disadvantages of Going Abroad for Holidays 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,
3、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 the passage. 2 Sleep Sleep is one of those funny things about being a human being y
4、ou just have to do it. Have you ever wondered why? And what about the crazy dreams, tike the one where a bad person is chasing you and you cant run or yell. Does that make any sense? Characteristics of Sleep We all know how sleep looks when we see someone sleeping, we recognize the following charact
5、eristics: -If possible, the person will lie down to go to sleep. -The persons eyes are closed. -The person doesnt hear anything unless it is a loud noise. -The person breathes in a slow, rhythmic pattern. -The persons muscles are completely relaxed. If sitting up, the person may fall out of his or h
6、er chair as sleep deepens. -During sleep, the person occasionally rolls over or rearranges his or her body. This happens approximately once or twice an hour. This may be the bodys way of making sure that no part of the body or skin has its circulation cut off for too long a period of time. In additi
7、on to these outward signs, the heart slows down and the brain does some pretty frightening things. In other words, a sleeping person is unconscious to most things happening in the environment. The biggest difference between someone who is asleep and someone who has fainted or gone into a coma is the
8、 fact that a sleeping person can be aroused if the stimulus is strong enough. If you shake the person, yell loudly or flash a bright light, a sleeping person will wake up. For any animal living in the wild, it just doesnt seem very smart to design in a necessary eight-hour period of near-total uncon
9、sciousness every day. Yet that is exactly what evolution has done. So there must be a pretty good reason for it! Who Sleeps? Reptiles(爬行动物 ), birds and mammals all sleep. That is, they become unconscious to their surroundings for periods of time. Some fish and amphibians reduce their awareness but d
10、o not ever become unconscious like the higher vertebrates(脊椎动物 ) do. Insects do not appear to sleep, although they may become inactive in daylight or darkness. By studying brainwaves, it is known that reptiles do not dream. Birds dream a little. Mammals all dream during sleep. Different animals slee
11、p in different ways. Some animals, like humans, prefer to sleep in one long session. Other animals (dogs, for example) like to sleep in many short bursts. Some sleep at night, while others sleep during the day. Sleep and the Brain If you attach an electroencephalograph(脑电图仪 ) to a persons head, you
12、can record the persons brainwave activity. A waking and relaxed person generates alpha waves, which are consistent vibrations at about 10 cycles per second. An alert person generates beta waves, which are about twice as fast. During sleep, two slower patterns called theta waves and delta waves take
13、over. Theta waves have oscillations in the range of 3.5 to 7 cycles per second, and delta waves have oscillations of less than 3.5 cycles per second. As a person falls asleep and sleep deepens, the brainwave patterns slow down. The slower the brainwave patterns, the deeper the sleep a person deep in
14、 delta wave sleep is hardest to wake up. REM Sleep At several points during the night, something unexpected happens rapid eye movement (REM) sleep occurs. Most people experience three to five intervals of REM sleep per night, and brainwaves during this period speed up to awake levels. If you ever wa
15、tch a person or a dog experiencing REM sleep, you will see their eyes flickering back and forth rapidly. In many dogs and some people, arms, legs and facial muscles will twitch(抽搐 ) during REM sleep. Periods of sleep other than REM sleep are known as NREM (non-REM) sleep. REM sleep is when you dream
16、, ff you wake up a person during REM sleep, the person can vividly recall dreams. If you wake up a person during NREM sleep, generally the person will not be dreaming. You must have both REM and NREM sleep to get a good nights sleep. A normal person will spend about 25 percent of the night in REM sl
17、eep, and the rest in NREM. A REM session a dream lasts five to 30 minutes. Medicine can hamper your ability to get a good nights sleep. Many medicines, including most sleeping medicines, change the quality of sleep and the REM component of it. Why Sleep? No one really knows why we sleep. But, there
18、are all kinds of theories, including these: -Sleep gives the body a chance to repair muscles and other tissues, replace aging or dead cells, etc. -Sleep gives the brain a chance to organize and store memories. Dreams are thought by some to be part of this process. -Sleep lowers our energy consumptio
19、n, so we need three meals a day rather than four or five. Since we cant do anything in the dark anyway, we might as well “turn off“ and save the energy. -According to Science News Online: Napless cats awaken interest in adenosine(腺苷 ), sleep may be a way of recharging the brain, using adenosine as a
20、 signal that the brain needs to rest: “Since adenosine secretion(分泌物 ) reflects brain cell activity, rising concentrations of this chemical may be how the organ judges that it has been burning up its energy reserves and needs to shut down for a while.“ Adenosine levels in the brain rise during wakef
21、ulness and decline during sleep. What we all know is that, with a good nights sleep, everything looks and feels better in the morning. Both the brain and the body are refreshed and ready for a new day. Dreams Why do we have such crazy, odd dreams? Why do we dream at all for that matter? According to
22、 Joel Achenbach in his book Why Things Are: The brain creates dreams through random electrical activity. Random is the key word here. About every 90 minutes the brain stem sends electrical impulses throughout the brain, in no particular order or fashion. The analytic portion of the brain the forebra
23、inthen desperately tries to make sense of these signals. It is like looking at a Rorschach test, a random splash of ink on paper. The only way of comprehending it is by viewing the dream (or the inkblot) metaphorically, symbolically, since theres no literal message. This doesnt mean that dreams are
24、meaningless or should be ignored. How our forebrains choose to “analyze“ the random and discontinuous images may tell us something about ourselves, just as what we see in an inkblot can be revelatory. And perhaps there is a purpose to the craziness: Our minds may be working on deep-seated problems t
25、hrough these circuitous and less threatening metaphorical dreams. Here are some other things you may have noticed about your dreams: -Dreams tell a story. They are like a TV show, with scenes, characters and props. -Dreams are egocentric. They almost always involve you. -Dreams incorporate things th
26、at have happened to you recently. They can also incorporate deep wishes and fears. -A noise in the environment is often worked into a dream in some way, giving some credibility to the idea that dreams are simply the brains response to random impulses. -You usually cannot control a dream in fact, man
27、y dreams emphasize your lack of control by making it impossible to run or yell. Dreaming is important. In sleep experiments where a person is woken up every time he/she enters REM sleep, the person becomes increasingly impatient and uncomfortable over time. 2 The author thinks sleep is a funny thing
28、 as it is necessary for human life. （ A） Y （ B） N （ C） NG 3 While sleeping, people might turn and toss if they are physically or mentally ill. （ A） Y （ B） N （ C） NG 4 A sleeping person and a fainted one are similar in that both can be waken by strong stimulus. （ A） Y （ B） N （ C） NG 5 When insects sl
29、eep, they may become inactive no matter whether it is in the day or at night. （ A） Y （ B） N （ C） NG 6 Unlike humans who tend to have one long sleep, dogs prefer to sleep in _. 7 While awake, people can produce _ waves in their brains. 8 If the eyes of a sleeping person flicker back and forth rapidly
30、, that means he or she is in _. 9 According to some theory, we only need breakfast, lunch and supper every day but no more because while sleeping, we can consume _. 10 According to Joel Achenbach, while dreaming, our brains experience _. 11 Our dreams tend to involve recent happenings to us and our
31、_. 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 the conversation and the questions will be spoken only once. After each question there will be a paus
32、e. 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 having a hard time letting his apartment. （ B） He prefers his old tenant to the new one. （ C） He is not accustomed to living with the new tenant yet. （ D） He doesnt want to let h
33、is apartment to her. （ A） Because it doesnt go directly to the park. （ B） Because it goes directly to the park. （ C） Because its much slower than a bus. （ D） Because its much less complicated that way and much quicker. （ A） He hasnt cleaned his room since Linda visited him. （ B） Linda is the only pe
34、rson who ever comes to see him. （ C） Hes been too busy to clean his room. （ D） Cleaning is the last thing he wants to do. （ A） Shes scornful. （ B） Shes sympathetic. （ C） Shes angry. （ D） Shes worried. （ A） Writing books that keep them interested. （ B） The ending of some stories. （ C） The fairy tales
35、 the woman has just covered. （ D） The science fiction the man will read. （ A） Shy: didnt expect there would be so many books. （ B） Four books are a lot to borrow from the library. （ C） She isnt sure he counted all his books. （ D） He has reminded her that she also has some books to return. （ A） Last
36、year. （ B） This year. （ C） In December. （ D） Three years ago. （ A） She sends her employees for frequent medical check. （ B） She leaves the office by 3:O0 or 4:O0 pm. （ C） She inspects her employees work several times a day. （ D） She pays her employees by check. （ A） To tell her that he cant attend h
37、er class today. （ B） To make an appointment with her for his roommate. （ C） To tell her that his roommate is unable to attend her class today. （ D） To discuss with her about his term paper. （ A） He almost forgets to hand in the term paper. （ B） He almost forgets to ask the location of Dr. Bailers of
38、fice. （ C） He almost forgets to ask for the information of a course in next semester. （ D） He almost forgets to make an appointment with Dr. Bauer. （ A） They have to take final exam. （ B） They have to give presentation. （ C） They have to read numerous books. （ D） They have to hand in a term paper of
39、 2,000 words. （ A） She wants Michael to check about the ATM service. （ B） She wants to know why the elderly avoid using computerized banking services. （ C） She wants Michael to have a try with their automatic banking services. （ D） She wants more information about modern machines in banks. （ A） Beca
40、use the services cost them more time. （ B） Because the services are not as friendly as a bank clerk. （ C） Because they are not sure how to use the services. （ D） Because the clerks dont offer help for them. （ A） To provide some instructions for the elderly. （ B） To remind the elderly of the personal
41、 services in the bank. （ C） To ask the clerks to offer help for the elderly. （ D） To simplify the operation of computerized banking services. （ A） She thinks they are impractical. （ B） She thinks they are useful but too expensive. （ C） She thinks they are feasible. （ D） She thinks they are not instr
42、uctive enough. 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 a question, you must choose the best answer from the four choices marked A, B, C
43、 and D. （ A） They thought she was too young. （ B） They thought she was small in size. （ C） They thought she did not play well enough. （ D） They thought she did not show much interest. （ A） They were both famous actresses. （ B） They were both popular all their lives. （ C） They were both rich and kind
44、-hearted. （ D） They were both successful when very young. （ A） Turning herself into a legend. （ B） Collecting money for the poor. （ C） Doing business and helping others. （ D） Going about research and education work. （ A） Historic significance. （ B） Splendor and peacefulness. （ C） Cultural appeal. （
45、D） Beauty and comfort. （ A） Visiting the capital of Salt Lake City. （ B） Visiting the Temple Square. （ C） Hiking through national parks. （ D） Hiking remote Indian reservations. （ A） All transportations during the tour. （ B） Equipment for the hiking adventure. （ C） Two nights stay in Salt Lake City.
46、（ D） Three formal meals a day. （ A） Reformers suggestions. （ B） The coming of a large population from Europe. （ C） The expansion of industrial cities. （ D） The requirement of specific populations. （ A） Women and men studied in the same classes. （ B） The amount of time spent on formal education was l
47、imited. （ C） New regulations were imposed on nontraditional education. （ D） Most places required children to attend school. （ A） Different groups needed different kinds of education. （ B） Special programs should be set up to modernize students. （ C） Women should stay at home. （ D） More women should
48、be involved in education and industry. （ A） More goods were produced than needed. （ B） Less goods were produced than needed. （ C） Immigrant women couldnt enjoy the right of educational. （ D） Immigrant women raised a lot of children. Section C Directions: In this section, you will hear a passage thre
49、e 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 down the 36 Although Beethoven could sit down and c
