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】________.
【C16】

选项 A、for
B、once
C、unless
D、while

答案D

解析 从后半句exercise has another effect可知前半句是让步关系,故选D项while“虽然”,表示转折、让步。A项for“由于”表示原因,B项once“一旦”表示条件,C项unless“除非”表示排除后面的情况。这三项都不能表示让步。
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