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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(热量)bread than increase physical exercise. The Centers for Disease Control, for example, found that fewer than one-fourth of overweight adults who were trying to shed pounds so did that they were combining exercise with their food.
    In rejecting exercise, some people may be unduly(过度地)discouraged by calorie-consuming sports; for example, one would have to quickly walk three miles just to work off the 275 calories in one delicious(美味的)cake. Even those who support exercise agree half a point here, and say,"Exercise by itself is a very tough way to lose weight. "
    Still the exercise’ s supporting role in weight reduction is essential. A study at the Boston University Medical Center of some overweight adults showed that those who dieted(节食)without exercise regained almost their old weight, while those who worked exercises not their daily routine maintained their new weight.
    If you have been accustomed to sitting long and decide to start walking one mile a day, the added exercise could burn an extra 100 calories daily. In a year’s time, supposing not increase in food in-take, you could lose ten pounds. By increasing the distance of your walks gradually and making other food adjustments, you may lose even more weight.
The main idea of the passage is______.
选项 A、getting up early in the morning can help lose body weight
B、being on diet without enough exercise can hardly lose weight
C、increasing exercises plays an important role in weight reduction
D、lightbeer and low-calorie bread should be kept away from over-weight adult
答案C
解析
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