Exercise is one of the few factors with a positive role in long-term control 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 efforts. The Centers for Disease Control, for example, found that fewer than one-fourth of overweight adults who were trying to lose weight said they were bining exercise with their diet.
In rejecting exercise, some people may be discouraged too much by caloric-expenditure（热量消耗）charts; for example, one would have to quickly walk hard three miles just to work off the 275 calories in one delicious Danish pastry(小甜饼). Even exercise professionals accept 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.
【小题1】What is said about the average American in the passage?A．They tend to hate light beer and low-calorie bread.B．They usually ignore the effect of exercise on losing weight.C．Most of them were bining exercise with their diet.D．They know the actors that play a positive role in keeping down body weight.【小题2】Even exercise professionals accept half a point here means They .A．agree that the calories in a small piece of pastry can be easy to work off by exerciseB．partially believe diet plays a supporting role in weight reductionC．are not fully convinced that dieting can help maintain one's new weightD．are not sufficiently informed of the positive role of exercise in losing weight【小题3】What was confirmed by the Boston University Medical Center's study?A．Controlling one's calorie intake is more important than doing exercise.B．Even occasional exercise can help reduce weight.C．Weight reduction is impossible without exercise.D．One could lose ten pounds in a year's time if there's no increase in food intake.【小题4】What is the author's purpose in writing this article?A．To stress the importance of maintaining proper weight.B．To support the statement made by York Onnen.C．To show the most effective way to lose weight.D．To introduce the study of the Boston University Medical Center.B
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(答案→)B
解析：文章大意：文章强调锻炼身体对于减肥和保持体重的重要性，而它的重要性却常常被美国民众忽视。
【小题1】细节理解题。根据第一段第二行的“that message has not gotten through to the average American”可知，that message指代第一句，exercise的作用还没有被美国的民众接受。故选B。
【小题2】细节理解题。根据第二段“Exercise by itself is a very tough way to lose weight”可知，通过锻炼身体来减肥比较辛苦，是一种较为困难的方法。第二段举的例子是为了说明运动量之大，A项曲解原意；这里讲的是exercise，与dieting无关；专家知道锻炼的积极作用，而不是要加大宣传。故选B。
【小题3】考查对段落大意的把握。根据第三段最后一句“while those who worked exercise into their daily routine maintained their new weight”可知，锻炼身体可以帮助减肥。故选C。
【小题4】考查作者的写作意图。作者强调的是锻炼身体对保持体重的重要性，A项偷换概念；York Onnen不完全相信锻炼身体的积极作用；Boston University的研究只是用来印证锻炼身体的一个例子。故选C。