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1、 试卷代号： A大学英语四级考试（CET 4）最新英语四级试卷及答案（2010年6月12日）注意事项一、 将自己的校名、姓名、学校代号、准考证号写在答题卡1和答题卡2上，将本试卷代号划在答题卡2上。二、 把试题册、答题卡均不得带出考场。考试结束后，教师收卷后才可离开考场。三、 仔细读懂题目的说明。四、 在30分钟内做完答题卡1上的作文题。30分钟后考生按指令启封试题册。在接着的15分钟内完成快速阅读理解部分的试题。然后监考员收取答题卡1，考生在答题卡2上完成其余部分的试题。全部答题时间为125分钟，不得拖延答题。五、 考生必须在答题卡上作答，凡写在试题册上的大案一律无效。六、 多项选择题每题只
2、有一个答案；如多选，则该题无分。选定答案后用HB-2B浓度的铅笔在相应的字母中划一条横线。划线要有一定的粗度，要盖过字母的底色。七、 如果要改动答案，必须先用橡皮擦净原来选定的答案，然后按规定重新答题。八、 在考试过程中要注意对自己的答案保密。若被他人抄袭，一经发现，后果自负。Part Writing (30 minutes)注意：此部分试题在答题卡 1上，请在答题卡1上作答。Part II Reading Comprehension (Skimming and Scanning) (15 minutes)Directions: In this part, you will have 15 m
3、inutes to go over the passage quickly and answer the questions on Answer Sheet 1. For questions 1-7, choose the best answer from the choices marked A), B), C) and D). For questions 8 to10, complete the sentences with the information given in the passage.Getting Thin for GoodJust about everyone has b
4、een on a diet at one time or another, and millions of us have learned that the weight we lose is all too easily regained. Still few people question the wisdom of dieting. After all, we reason, the worst that can happen is that well regain the weight weve lost then we can simply go on a diet again.Bu
5、t some new research suggests there is a risk: yo-yo dieting may seriously distort the bodys weight-control system. The more diets you go on, the harder it may become to lose weight. Even worse, new evidence indicates that repeated cycles of losing and gaining weight may raise the risk of heart probl
6、ems.This last possibility is especially disturbing. As part of a 25-year study that monitored 1 959 men, researchers at the University of Texas School of Public Health in Houston reported in March 1987 that the men showing large up-and-down weight changes had twice the risk of heart disease as those
7、 with only small changes in weight. One paper from the Framingham (Mass.) Heart Study, which has monitored more than 5 000 people for 40 years, also provides troubling information: people who lost ten percent of their body weight had about 20 percent reduction in risk of heart disease but people who
8、 gained 10 percent raised the risk by 30 percent. These numbers further suggest that going from 150 to 135 pounds, and back to 150 again, could leave you with a higher heart-disease risk than you started with.When you cut calories and lose weight, your body will protect itself by reducing your basal
9、 metabolic rate (BMR). This is the measure of the energy used for routine functions such as breathing and cell repair roughly 60 to 75 percent of the energy consumed by the body. During severe dieting, your BMR drops within 24 hours and can decline a full 20 percent within two weeks. This metabolic
10、decline is one reason dieters often reach a steady unchanging period, and find that the same caloric intake which melted pounds earlier now produces no weight loss.The body adapts to dieting in other ways. The enzyme lipoprotein lipase (脂肪酶), a chemical in the body, which controls how much fat is st
11、ored in fat cell, may become more active in some overweight people after they have lost weight. That would make the body more efficient at fat storage exactly what the dieter doesnt want. And this change, like the drop in BMR, may be part of the reason dieters frequently regain their lost weight.My
12、interest in the yo-yo problem began in 1982, when my colleagues Thomas Wadden and Albert Stunkard and I were experimenting with very-low-calorie diets 800 calories or fewer per day. We hoped that patients in our clinic could lose large amounts of weight rapidly, then keep the weight loss with a beha
13、vior-modification program.We found, however, that some people lost weight rapidly, some slowly; some lost for a while and then stopped losing. One woman, Marie, began the program at 230 pounds, reduced to 192 pounds, and then hit a wall, even though she stayed on her diet and walked two miles a day.
14、 Marie, like many others in our program, had been a yo-yo dieter, and they tended to have the most difficulty in losing weight.To see if such dieting could really change the body this way, other researchers and I began to study weight changes in animals. We fed a group of rats a high-fat diet until
15、they became obese. Then we changed their diets repeatedly to make them lose weight, regain, lose again and regain again.The results were surprising. The first time the rats lost weight, it took 21 days for them to go from obese to normal weight. On their second diet, it took 46 days, even though the
16、 rats consumed exactly as many calories.With each yo-yo, it became easier for the rats to regain. After the first diet, they took 46 days to become obese again; after the second diet, they took only 14 days. In other words on the second yo-yo cycle, it took more than twice as long to lose -weight, and only one-third as long to regain it.Surprised, our group contacted Har
