大学英语四级考试仔细阅读练习试题(12)_大学英语阅读

大学英语四级考试仔细阅读练习试题(12)

　　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 Presidents Council on Physical Fitness and Sports.

　　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.