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】________.  
【C20】

选项 A、declined
B、revived
C、vanished
D、increased

答案A

解析 转折连词But连接两个对比的句子,上文中的“在社会经济等级中……高的人”与“那些来自于……和收入较低家庭的人”是两个相反的群体。因此相应的参与情况(participation)也应是相反的。故选与上文increased相反的A项declined“下降”。B项revived“复兴”和D项increased“增加”跟上文的increased近义或相同,均可排除。C项vanished“消失”则过于绝对。
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