What is the passage mainly about? [br] In the US Nurses’ Health Study, women who

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问题 What is the passage mainly about? [br] In the US Nurses’ Health Study, women who slept an average of 7 hours a night ______ .

选项 A、gained the least weight
B、were inclined to eat less
C、found their vigor enhanced
D、were less susceptible to illness

答案 A

解析根据题干中大写的US Nurse’s Health Study和数字“7 hours”可回原文中快速定位至第一个小标题下第二段的最后一句话。该句将睡眠时间分别为5小时、6小时和7小时的三组人群的体重进行比较，结论是睡眠时间越少，体重就越重，所以选A项。

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