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  3. More than 45 million Americans now belong to a health club. We spend some $19 billion a year on gym memberships. Of course, some

More than 45 million Americans now belong to a health club. We spend some $19 billion a year on gym memberships. Of course, some

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问题     More than 45 million Americans now belong to a health club. We spend some $19 billion a year on gym memberships. Of course, some people join and never go.
    According to a survey, the number of people who said they【C1】________regular exercise, has been rising. And yet obesity【C2】________have risen significantly: a third of Americans are obese, and another third【C3】________as overweight by the Federal Government’s【C4】________. Yes, it’s entirely possible that those of us who regularly go to the gym would weigh even more if we exercised【C5】________. But like many other people, I get hungry after I exercise,【C6】________I often eat more on the days I work out than on the days I don’t. Could exercise actually be keeping me from losing weight?
    The【C7】________wisdom that exercise is essential for shedding pounds is actually fairly【C8】________. As recently as the 1960s, doctors routinely advised against【C9】________exercise, particularly for older adults who could【C10】________themselves. Today doctors encourage even their oldest patients to exercise, which is sound advice for many reasons: People who regularly exercise are at significantly lower risk for all manner of【C11】________—those of the heart in particular. They less often develop cancer, diabetes and many other illnesses. But the past few years of obesity research show that the role of exercise in weight loss has been wildly【C12】________.
    "In general, for weight loss, exercise is pretty【C13】________," says Eric Ravussin, chair in diabetes and metabolism at Louisiana State University and a prominent exercise researcher. Many recent studies have found that exercise isn’t as important【C14】________helping people lose weight as you hear so regularly in gym advertisements or on【C15】________like The Biggest Loser.
    The basic problem is that【C16】________it’s true that exercise bums calories and that you must burn calories to lose weight, exercise has another effect it can【C17】________hunger. That causes us to eat more, which【C18】________can deny the weight-loss benefits we just【C19】________. Exercise, in other words, isn’t necessarily helping us lose weight. It may even be making it【C20】________.
【C20】
选项 A、heavier
B、quicker
C、lighter
D、harder
答案D
解析 根据前一句“运动对减肥来说未必有作用”和空格前的even，可推断出运动可能使减肥变得更艰难，故选D项harder“更难”。A项heavier“更重的”，C项lighter“更轻的”，均不能用来形容减肥的过程或成果。B项quicker“更快的”。既然不一定对减肥有用，就更不可能是减肥更快了。
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