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 tr ...

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 __1__ 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 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; for example, one would have to __3__ 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," __5__ says York Onnen, the program director of the President's Council on __6__ Physical Fitness and Sports.

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 __8__ without exercise regained almost all their old weight, 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 __9__ increase in food takein, you could lose ten pounds. By increasing the __10__ distance of your walks gradually and making other dietary adjustments,you may lose even more weight.　　

答案：

1.that--who．that從句修飾的是the average American，而且它是一個非限定性定語從句，而that無法引導一個非限定性定語從句，所以應把that改為who。

2.adults^--who．found后接的從句中主要的動詞應該是said，而不是try to shed pounds，所以應該在were前面加上who構成定語從句修飾overweight adults。

3.expending--expenditure．由于caloric是形容詞，表示“屬于或者關于卡的”，它后面不能接動詞的-ing形式，而且expending和charts的關系也不成立，所以應該改為名詞expenditure。

4.work^--off．work off有消耗之意，符合文義。

5.in--by(直接把in 去掉也可以吧？)．in itself 表示“本身，本質上”，而我們都知道鍛煉是一減肥的好方法，只是不能僅靠鍛煉，還需配之以適當的飲食控制，所以應該把in itself換成by itself，表示“單獨”。

6.the(program)--/．在用作同位語表示獨一無二的職位的名詞之前，通常用零冠詞。

7.Therefore--Still/Neverthless．根據上下文，這里要表達的關系是讓步，不是因果。

8.diet--dieted．這里敘述的是過去的一項研究。

9.assumed--assuming．assume和you的關系應是主動的，所以應改為assuming。

10.takein--intake．take in 表示“攝入，吸收”，它的名詞形式不是take in，而是 intake。