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 childhood 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 sidewalks 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”。
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