What is the passage mainly about? Who are most likely to be overweight according to Katherine Flegal’s study?

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问题 What is the passage mainly about?
Who are most likely to be overweight according to Katherine Flegal’s study?

选项 A、Heavy smokers.
B、Passive smokers.
C、Those who never smoked.
D、Those who quit smoking.

答案D

解析 根据题干中的人名Katherine Flegal定位至原文第三个小标题下第二段,答案出现在该段最后一句话中对三组人群的对比:戒烟者、从未吸烟者和吸烟者的肥胖率分别为50%、37%和28%。因此答案应该选D项“戒烟者”。
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