“I'm sure there are some detrimental__16__of staying still for too long, but I hope that being__17__when I can helps，” he said. “I wouldn't want to think the sitting could be__18__dangerous.”

　　Still, in a study published last year that tracked more than 17,000 Canadians for about a dozen years, researchers found people who sat__19__had a higher death risk, independently of whether or not they exercised.

　　Figures from a US survey in 2003～2004 found Americans spend more than half their time sitting, from working at their desks to sitting in cars.

　　Experts said more research is needed to__20__just how much sitting is dangerous, and what might be possible to offset those effects.

　　文章大意：本文说明的是：越来越多的科学家提醒，即使经常锻炼身体，长时间坐着也会对健康产生有害影响。

　　1. A. bad

　　B. good

　　C. mean

　　D. dead

　　答案：A　此处意为：长时间坐着也会对健康产生坏影响，故选A项。

　　2. A. does

　　B. occurs

　　C. matches

　　D. dies

　　答案：B　不管你坐在哪里，它都会发生。occurs符合句意。

　　3. A. advise

　　B. talk

　　C. suggest

　　D. say

　　答案：C　但已有几项研究显示，故选suggest。advise“建议”，talk“谈论”和say“说”均不符合句意。

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