单选题：Manypeopledonotengageinphysicalexercisemainlybecause________

题目分类：卫生类
题目类型：单选题
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题目内容：

Manypeopledonotengageinphysicalexercisemainlybecause__________. A．theyarenotawareofitsbenefits
B．theydon'thavethefacilities
C．theydon'tthinktheyneedit
D．theyarephysicallyunfitforit

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