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 c-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 aday，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.
“Even exercise professionals concede halfa point here”(Line 3，Para．2)means“They(       )”．

选项 A、agree that the calories in a small piece of pastry can be difficult to work off by exercise
B、partially believe diet plays a supporting role in weight reduction
C、age not fully convinced that dieting call help maintain one’s new weight
D、age not sufficiently informed of the positive role of exercise in losing weight

答案C

解析本题的关键是对“These fitness spas did not seem to benefit financially form the aerobicfitness movement to better health，since medical opinion suggested that weight—training programs offered few，if any，health benefits”一句的理解。这句话由前面的主句和since引导的从句组成。主句的意思是“这些健身场所似乎没有从这场追求健康的有氧操风潮中受益”，从句由since引出了原因：医学观点认为。健身锻炼项目不会给健康带来多少益处。few是带有否定意义的词，表示很少，几乎没有。if any，“如果还有益处的话”，也是对存在益处的疑问。由此可见，医学观点(也就是医生的观点)对weight training的态度应该是非常消极的，所以选择G。这里不应选择D，因为cautious指在诸多积极因素中存在一定的消极因素，应谨慎对待，不应过分积极，这与文意不符。

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