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, that would rather try switching to __1__
　　"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 were trying to shed __2__
　　pounds said they were combining exercise with their diet.
　　In rejecting exercise, some people may be discouraged too much by calorie-expending charts; __3__
　　for example, one would have to briskly walk three miles just to work the 275 calories in one __4__
　　delicious Danish pastry. Even exercise professionals concede half a point here.
　　"Exercise in itself is a very tough way to lose weight," says York Onnen, __5__ 
　　the program director of the President's Council on Physical Fitness and Sports. __6__
　　Therefore, exercise's supporting role in weight reduction is vital. __7__
　　A study at the Boston University Medical Center of overweight police　officers and other public
　　employees confirmed that those who diet without exercise regained almost all their old weight, __8__
　　while those　who worked exercise into their daily routine maintained their new　weight.
　　If you decide to start walking one mile a day, the added exercise　could burn
　　an extra 100 calories daily.In a year's time, assumed no increase in __9__
　　food taken, you could lose ten pounds. By increasing the distance of your walks gradually __10__ 
　　and making other dietary adjustments,you may lose even more weight.

　　答案：1.that--who．that从句修饰的是the average American，而且它是一个非限定性定语从句，而that无法引导一个非限定性定语从句，所以应把that改为who。
　　2.adults^--who．found后接的从句中主要的动词应该是said，而不是try to shed pounds，所以应该在were前面加上who构成定语从句修饰overweight adults。
　　3.expending--expenditure．由于caloric是形容词，表示“属于或者关于卡的”，它后面不能接动词的-ing形式，而且expending和charts的关系也不成立，所以应该改为名词expenditure。
　　4.work^--off．work off有消耗之意，符合文义。
　　5.in--by(直接把in 去掉也可以吧？)．in itself 表示“本身，本质上”，而我们都知道锻炼是一减肥的好方法，只是不能仅靠锻炼，还需配之以适当的饮食控制，所以应该把in itself换成by itself，表示“单独”。
　　6.the(program)--/．在用作同位语表示独一无二的职位的名词之前，通常用零冠词。
　　7.Therefore--Still/Neverthless．根据上下文，这里要表达的关系是让步，不是因果。
　　8.diet--dieted．这里叙述的是过去的一项研究。
　　9.assumed--assuming．assume和you的关系应是主动的，所以应改为assuming。
　　10.taken--intake．take in 表示“摄入，吸收”，它的名词形式不是take in，而是 intake

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