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  3. Exercise is one of the few factors with a positive role in long—term maintenance of body weight．Unfortunately，that message has n

Exercise is one of the few factors with a positive role in long—term maintenance of body weight．Unfortunately，that message has n

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问题  Exercise is one of the few factors with a positive role in long—term maintenance of body weight．Unfortunately，that message has not gotten through to the average American，who would rather try switching to“light”beer and low-calorie bread than increase physical exertion．The Centers for Disease Control，for example，found that fewer than one—fourth of overweight adults who were trying to shed pounds said they were combining exercise with their diet．
  In rejecting exercise，some people may be discouraged too much by calori c-expenditure charts：for example，one would have to briskly walk three miles just to work off the 275 calories in one delicious Danish pastry(小甜饼).Even exercise professionals concede half a point here．
“Exercise by itself is a very tough way to lose weight，”says York Onnen，program director of the President’s Council on Physical Fitness and Sports．
  Still，exercise’s supporting role in weight reduction is vital．A study at the Boston University Medical Center of overweight police officers and other public employees confirmed that those who dieted without exercise regained almost all their old weight，while those who worked exercise into their daily routine maintained their new weight．
  If you have been sedentary(极少活动的)and decide to start walking one mile aday，the added exercise could burn an extra 100 calories daily．In a year’s time，assuming no increase in food intake，you could lose ten pounds．By increasing the distance of your walks gradually and making other dietary adjustments，you may lose even more weight.
What is the author’s purpose in writing this article?(          )
选项 A、To iustify the study of the Boston University Medical Center
B、To stress the importance of maintaining proper weight
C、To support the statement made by York Onnen
D、To show the most effective way to lose weight
答案D
解析 注意第二段中间部分提到了in recent years，此后的部分应该是对近来状况的描述，答案也在这里。“evidence has shown that training programs designed primarily to improve muscular strength andendurance might also offer some health benefits as well”从这一句可知，近来的研究表明健身锻炼也可以带来健康益处，这与D的说法一致，应该选D。
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