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

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

admin2010-02-20  107
问题 Exercise is one of the few factors with a positive role in longterm 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 calorieexpenditure charts, for example, one would have to briskly walk three miles just to work off the 275 calories in one delicious Danish pastry. Even exercise professionals concede half a point here. "Exercise by itself is a very tough way to lose weight." said 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 the author’s purpose in writing this article?
选项 A、To justify 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 主旨大意题。纵观全文，文章首先提到“运动是能够在长期保持体重方面发挥积极作用的几个因素之一。”是全文的主旨句，接着作者在后面的论述中都是为了说明这一主题思想。故选项D正确。选项A“为了证明波士顿医疗中心研究成果正确”及选项Cc为了支持York Onnen的陈述的说法太片面，选项B为了强调保持合适体重的重要性与文章内容偏离，也不正确。
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