What is the main idea of this passage?

A. People should keep exercising.
B. Exercising may not reduce the harm of sitting.
C. Sitting for long time is deadly.
D. How to eliminate the harm of sitting.

【答案】:C
本文主要讲述了久坐危害健康,甚至引起死亡的研究发现,也就是文章开头提到的“Sitting is deadly.”(久坐会致命),C项正确,A项突出了“exercisin9”,偷换了文章主题;B项意为“锻炼身体可能不会缓解久坐的危害”,该说法片面;D选项意为“如何消除久坐的危害?”,文章倒数第二段提到“Experts said more research is needed to figure out just how muchsitting is dangerous,and what might be possible tooffset those effects.”.可见目前还没有发现消除久坐危害的对策,故该项错误。
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