It can be inferred from the last pa-考呗网

英语四级

单选题It can be inferred from the last paragraph that scientists（　　）.

A．are puzzled by the mystery of forest pollution
B．feel relieved by the use of unleaded gasoline
C．still consider lead pollution a problem
D．lack sufficient means to combat lead pollution

参考答案：C进入在线模考

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1Questionsare based on the following passage.
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, who would rather try 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 who were trying to shed pounds said they were combining exercise with their diet.
In rejecting exercise, some people may be discouraged too much by caloric-expenditure charts: for example, one would have to briskly walk three miles just to work off the 275 calories in one delicious Danish pastry （小甜饼）. Even exercise professionals concede 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.
What is said about the average American in the&nb

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2Some 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

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3“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）

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