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  3. Several years into a campaign to get kids to eat better and exercise more, child obesity rates have appeared to stabilize, and m

Several years into a campaign to get kids to eat better and exercise more, child obesity rates have appeared to stabilize, and m

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问题     Several years into a campaign to get kids to eat better and exercise more, child obesity rates have appeared to stabilize, and might be poised for a reversal.
    But a study published Monday in the journal PNAS suggests that among adolescents, the【C1】________signs are limited to those from better-educated, more【C2】________families. Among teens from poorer, less well-educated families, obesity has【C3】________to rise.
    That class-gap was not【C4】________in younger children. But as children neared【C5】________, the class differences became increasingly obvious.
    【C6】________between rich and poor in obesity rates are not new, and they are only one of many health gaps that make poor patients sicker and more likely to die【C7】________than richer ones. But if the public health message on obesity "has not diffused【C8】________across the population," this gap could【C9】________efforts to stem a tidal wave of【C10】________obesity-related diseases in the years ahead.
    Researchers from Harvard University’s Kennedy School of Government found that【C11】________activity may account largely for the【C12】________trend in obesity between rich and poor.
    If public health experts are to prevent child-hood obesity and【C13】________drive down future obesity among adults, they’ll have to figure out【C14】________less advantaged kids don’t get as much exercise, the authors of the latest study say. Yes, lack of【C15】________centers, playgrounds, and streets and side-walks that【C16】________walking, biking and playing are important, they wrote.
    But, they added, "this is not the whole story." Among children with parents who【C17】________high on the socioeconomic scale, participation in high school sports and clubs has increased. But among their【C18】________from families of lower educational【C19】________and income, such participation has【C20】________.  
【C13】
选项 A、because
B、whereas
C、thereby
D、unless
答案C
解析 句中prevent“预防”和drive down“降低”、childhood“儿童期”和adults“成年期”之间的先后顺序提示drive down future obesity among adults是prevent childhood obesity的目的。故选表目的的C项thereby“从而”。A项because“因为”，表原因，后需接从句，B项whereas“然而”，表转折，D项unless“除非”，表条件，均与句中逻辑关系不符。
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