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.
26. What is said about the average American in the passage?
A) They tend to exaggerate the healthful effect of “light” beer.
B) They usually ignore the effect of exercise on losing weight.
C) They prefer “light” beer and low-calorie bread to other drinks and food.
D) They know the factors that play a positive role in keeping down body weight.(B)
27. Some people dislike exercise because ________.
A) they think it is physically exhausting
B) they find it hard to exercise while on a diet
C) they don’t think it possible to walk 3 miles every day
D) they find consulting caloric-expenditure charts troublesome(B)
28. “Even exercise professionals concede half a point here” (Line 3, Para. 2) means “They ________”.
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) are not fully convinced that dieting can help maintain one’s new weight
D) are not sufficiently informed of the positive role of exercise in losing weight(B)
29. 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.(C)
30. What is the author’s purpose in writing this article?
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.(D)
本文讲的是身体锻炼在减肥中的作用。全部材料共四个段落，各论述不同方面的内容。前两段可以作为一个整体，主要讲许多人在减肥时只节食不锻炼的事实(第一段)和原因(第二段);后两段也可以做为一个整体，主要论述材料的核心观点：体育锻炼对减肥的重要性，第三段从正面强调了这一观点，最后一段以走路为例对这一观点做了支持。
第一段指出了许多减肥中的美国人对体育锻炼不够重视的事实，引出材料的论题。第一句话实际上就已经提出了文章的中心论点：锻炼是对长期保持体重起积极作用的少有因素之一(Exercise is one of the few factors with a positive role in long-term maintenance of body weight)，只是文章没有马上对这个观点进行正面论述，而是先列出美国人普遍存在的不锻炼现象，以反托正。这里需要注意几点信息，一是锻炼对减肥的帮助体现在较长时期上，最后一段的例子也是围绕这一信息的。二是这里讨论的锻炼只针对于重视节食的减肥人群，不是普通人。
第二段解释了减肥人群不重视身体锻炼的原因。作者用数据说话：精神抖擞地步行3英里才只消耗掉一个小甜饼的热量——275卡路里(briskly walk three miles just to work off the 275 calories)。而后用专业人士的话做以总结：身体锻炼费力不讨好(a very tough way to lose weight)。
最后二段从正面对身体锻炼在减肥中的作用做了论述。作者引用波士顿大学医疗中心的研究成果，指出不锻炼的人的体重多数会反弹(those who dieted without exercise regained almost all their old weight)，而锻炼的人则不会(those who worked exercise into their daily routine maintained their new weight)。然后以走路为例向人们说明身体锻炼确实对减肥有所帮助。
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