Still, exercises 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 years 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 lightbeer.

　　B) They usually ignore the effect of exercise on losing weight.

　　C) They prefer lightbeer and low-calorie bread to other drinks and food.

　　D) They know the factors that play a positive role in keeping down body weight.

　　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 dont think it possible to walk 3 miles every day

　　D) they find consulting caloric-expenditure charts troublesome

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