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

　　Passage Four

　　Questions 26 to 30 are 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 . 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

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