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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】________.
【C2】
选项 A、growth
B、indexes
C、figures
D、variation
答案C
解析 根据此句冒号后的内容：三分之一的美国人属于肥胖(obese)，另外三分之一也属于超重(overweight)，由此可看出美国的肥胖人数增速明显。选C项figures“(用数学表示的)数量”。因为这里讲的是肥胖人数的增长，而A项growth与obesity搭配，只表示“肥胖增长”，后面多一个rate(率)才能选它。B项indexes与obesity连用表示“肥胖指数”，指的是单个人是否属于肥胖的衡量标准，与后面指的全体美国人的概念不同。D项variation“变化”无法与前面的obesity搭配，变化本身可能就是忽高忽低的，不能说变化是risen的。
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