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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

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

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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 lowcalorie bread than increase physical exertion. The Centers for Disease Control, for example, found that fewer than onefourth 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 caloricexpenditure 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 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 said about the average American in the passage?
选项 A、They tend to exaggerate the healthful effect of "light" beer.
B、They usually ignore the effect of exercise on losing weight.
C、They prefer "light" beer and lowcalorie bread to other drinks and food.
D、They know the factors that play a positive role in keeping down body weight.
答案B
解析 细节理解题。本题定位原文的第一自然段。作者在这一段开头就指出，虽然锻炼是能够在长期保持体重方面起积极作用的为数不多的因素之一，但这种观念还未被一般美国人所理解。而选项B)正是这个意思的总结，所以选B)。
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