六级真题及答案A卷.docx

1、六级真题及答案A卷Part I writing (30 minutes)注意：此部分试题在答题卡1上Part II Reading Comprehension (Skimming and scanning) (15 minutes)Supersize surpriseAsk anyone why there is an obesity epidemic and they will tell you that its al down to eating too much and burning too few calories. That explanation appeals to commo

2、n sense and has dominated efforts to get to the root of the obesity epidemic and reverse it/ yet obesity researchers are increasingly dissatisfied with it. Many now believe that something else must have changed in our environment to precipitate(促成) such dramatic rises in obesity over the past 40 yea

3、rs or so. Nobody is saying that the “big two” reduced physical activity and increased availability of food are not important contributors to the epidemic, but they cannot explain it all.Earlier this year a review paper by 20 obesity experts set out the 7 most plausible alternative explanations for t

4、he epidemic. Here they are.1. Not enough sleepIt is widely believed that sleep is for the brain, not the body. Could a shortage of shut-eye also be helping to make us fat?Several large-scale studies suggest there may be a link. People who sleep less than 7 hours a night tend to have a higher body ma

5、ss index than people who sleep more, according to data gathered by the US National Health and Nutrition Examination Survey. Similarly, the US Nurses Health Study, which tracked 68,000 women for 16 years, found that those who slept an average of 5 hours a night gained more weight during the study per

6、iod than women who slept 6 hours, who in turn gained more than whose who slept 7.Its well known that obesity impairs sleep, so perhaps people get fat first and sleep less afterwards. But the nurses study suggests that it can work in the other direction too: sleep loss may precipitate weight gain.Alt

7、hough getting figures is difficult, it appears that we really are sleeping less. In 1960 people in the US slept an average of 8.5 hours per night. A 2002 poll by the National Sleep Foundation suggests that the average has fallen to under 7 hours, and the decline is mirrored by the increase in obesit

8、y.2. Climate controlWe humans, like all warm-blooded animals, can keep our core body temperatures pretty much constant regardless of whats going on in the world around us. We do this by altering our metabolic(新陈代新的) rate, shivering or sweating. Keeping warm and staying cool take energy unless we are

9、 in the “thermo-neutral zone”, which is increasingly where we choose to live and work.There is no denying that ambient temperatures(环境温度) have changed in the past few decades. Between 1970 and 2000, the average British home warmed from a chilly 13C to 18C. In the US, the changes have been at the oth

10、er end of the thermometer as the proportion of homes with air conditionings rose from 23% to 47% between 1978 and 1997. In the southern states where obesity rates tend to be highest the number of houses with air conditioning has shot up to 71% from 37% in 1978.Could air conditioning in summer and he

11、ating in winter really make a difference to our weight?Sadly，there is some evidence that it does-at least with regard to heating. Studies show that in comfortable temperatures we use less energy.3.Less smokingBad news: smokers really do tend to be thinner than the rest of us,and quitting really does

12、 pack on the pounds, though no one isn sure why. It probably has something to do with the fact that nicotine is an appetite suppressant and appears to up your metabolic rate.Katherine Flegal and colleagres at the US National Center for Health Statistics in Hyattsville,Maryland, have calculated that

13、people kicking the habit have been respousible for a small but significant portion of the US epidemic of fatness.From data collected aroud 1991 by the US National Health and Nutrition Examination Survey,they worked out that people who had quit in the previous decade were much more likely to be overw

14、eight than smokers and people who had never smoked .Among men, for example, nearly half of quitters were overweight compared with 37% of non-smokers and only 28%of smokers.4. Genetic effectsYours chances of becoming fat may be set,at least in part,before you were even born.children of boese mothers

15、are much more likely to become obest themselves later in life.Offspring of mice fed a high-fat diet during pregnancy are much more likely to become fat than the offspring of identical mice fed a normal diet. Intriguingly,the effect persists for two or three generations.Grand-children of mice fed a h

16、igh-fat diet grow up fat even if their own mother is fed normally-so you fate may have been sealed even before you were conceived.5.A little olderSome groups of people just happen to be fatter than others.surveys carried out by the US national center for health statisties found that adults aged 40 t

17、o 79 were around three times as likely to be obese as younger people.non-white females also tend to fall at the fatter end of the spectreum:Mexican-american women are 30% more likely than white women to be obsess,and black women have twice the risk.In the US,these groups account for an increasing pe

18、rcentage of the population.between 1970 and 2000 the US population aged 35 to 44 grew by 43%.the proportion of Hispanic-americans also grew,from under 5% to 12.5% of the population,while the proportion of black Americans increased from 11% to 12.3%.these changes may account in part for the increased

19、 prevalence of obesity.6.mature mumsMothers around the world are getting older.in the UK,the mean age for aving a frist child is 27.3,compared with 23.7 in 1970 .mean age at frist birth in the US has also increased, rising from 21.4 in 1970 to 24.9 in 2000.This would be neither here nor there if it

20、weret for the observation that having an older mother seems to be an independent risk factor for obesity. Results from the US national heart,lung and blood institutes study found that the odds of a child being obese increase 14% for every five extra years of their mothers age , though why this shoul

21、d be so is not entirely clear.Michael Symonds at the university of Nottingham,UK,found that first-bron children have more fat than younger ones. As family size decreases, firstbrons account for a greather share of the population. In 1964, british women gave birth to an average of 2.95 children;by 20

22、05 that figure had fallen to 1.79. in the US in 1976, 9.6% of woman in their 40s had only one chile;in 2004 it was 17.4%. this combination of older mothers and more single children could be contributing to the obesity epidemic.7.Like marrying likeJust as people pair off according to looks, so they d

23、o for size. Lean people are more likely to marry lean an d fat more likely to marry fat. On its own, like marrying like cannot account for any increase in obesity. But combined with others- particularly the fact that obesity is partly genetic, and that heavier people have more children-it amplifies

24、the increase form other causes.1. A)effects of obesity on peoples healthB)the link between lifestyle an obesityC)New explanations for the obesity epidemicD)possible ways to combat the obesity epidemic2. A)gained the least weightB)were inclined to eat lessC)found their vigor enhancedD)were less susce

25、ptible to illness3. A)it makes us sleepyB)it causes sleep lossC)it increases our appetiteD)it results from lack of sleep4. A)it makes us stay indoors moreB)it accelerates our metabolic rateC)it makes us feel more energeticD)it contributes to our weight gain5. A)it threatens their healthB)it heighten

26、s their spiritsC)it suppresses their appetiteD)it slows down their metabolism6. A)heavy smokersB)passive smokersC)those who never smokeD)those who quit smoking7. A)the growing number of smokers among young peopleB)the rising proportion of minorities in its populationC)the increasing consumption of h

27、igh-calorie foodsD)the improving living standards of the poor people8.according to the US National Heart, Lung and Blood Institute, the reason why older mothers children tend to be obese remains not entirely clear9.According to Michael Symonds, one factor contributing to the obesity epidemic is decr

28、ease of family size10 when two heavy people get married, chances of their children getting fat increase, because obesity is party genetizPart III Listening ComprehensionSection A11. A)He is quite easy to recognizeB)he is an outstanding speakerC)he looks like a movie starD)he looks young for his age1

29、2. A)consult her dancing teacherB)take a more interesting classC)continue her dancing classD)improve her dancing skills13. A)the man did not believe what the woman saidB)the man accompanied the woman to the hospitalC)the woman may be suffering from repetitive strain injuryD)the woman may not followe

30、d the doctors instructions14. A)they are not in style any moreB)they have cost him far too muchC)they no longer suit his eyesightD)they should be cleaned regularly15. A)he spilled his drink onto the floorB)he has just finished wiping the floorC)he was caught in a shower on his way homeD)he rushed ou

31、t of the bath to answer the phone16. A)fixing some furnitureB)repairing the toy trainC)reading the instructionsD)assembling the bookcase17. A)urge Jenny to spend more time on studyB)help Jenny to prepare for the coming examsC)act towards Jenny in a more sensible wayD)send Jenny to a volleyball train

32、ing center18. A)The building of the dam needs a large budgetB)the proposed site is near the residential areaC)the local people fel insecure about the damD)the dam poses a threat to the local environmentQuestion19 to21 are based on the conversation you have just heard19 A. It saw the end of its booming years worldwideB. Its production and sales reached record levels.C. It became popular in some foreign countriesD. Its domestic market started to shrink rapidly.20. A. They cost