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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 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 caloric-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 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 从前面的分析可知，这篇文章主要讲的是锻炼在减肥中的重要性，A和C提到的人物和机构都只是作者用来支撑这一观点的论据，可以首先排除。B的说法也是明显错误的．文章讲的是如何保持合适的体重，而不是在强调其重要性。作者强调了身体锻炼在减肥中的重要性，向人们说明最好在节食的同时参加体育锻炼，这可以说是介绍了一种最好的减肥方法。
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