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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 eexpenditure 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 a day,the added exercise could burn an extra 1 00 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．
Some people dislike exercise because(    )．
选项 A、they think it is physically exhausting
B、they find it hard to exercise while on a diet
C、they don’t think it possible to walk 3 miles every day
D、they find consulting caloric—expenditure charts troublesome
答案B
解析 第二段专门对有些人不喜欢锻炼的原因进行了说明，主要有两句话。第一句“some people may be discouraged too much by caloric-expenditure charts”，这句话的意思是“卡路里消耗表会使有些人非常泄气”，后面给出了原因，即锻炼消耗的卡路里太少。由此看来，并不是他们觉得参考卡路里消耗表麻烦，D的说法不对。第二句借专业人士之口说出了原因“Exercise by itself is a very tough way to lose weigh．”“ tough”这个词强调艰苦、艰难性，也就是说用锻炼来减肥太过于艰难了。与前面消耗卡路里的说法结合起来就是：因为锻炼消耗的卡路里非常少，所以要想减肥的话，锻炼的投入要非常大才能起到效果。
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