Exercise is one of the few factors with a positive role in long—term maintenance of body weight.Unfortunately,that message has n

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问题  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 calori c-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 aday,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.
Some people dislike exercise because(          ).

选项 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

答案B

解析 注意文章中的“A number of fitness spas existed prior to this aerobic fitness movement,even a national chain with spas in most major cities”这里的prior to是“先于……”的意思,那么主语指的就是“在有氧健身风潮开始之前就已经存在的健身场所”,这也就是本题所说的早期的健身场所。此后的一句“theirfocus was not on aerobics,but rather on weight—training programs designed to develop muscular mass,strength,andendurance in their primarily male enthusiasts”,这里的their指代的就是早期健身场所了。not on aerobics,重点不在有氧操上(排除了A);develop muscular mass,strength,and endurance,发展肌肉、力量和耐力(与B一致)。本题选B。
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