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  3. In the United States, elementary and middle schools are advised to give students two and a half hours of physical activity a wee

In the United States, elementary and middle schools are advised to give students two and a half hours of physical activity a wee

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问题 In the United States, elementary and middle schools are advised to give students two and a half hours of physical activity a week.
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答案在美国，人们建议小学和中学给学生每周两个半小时的体育活动时间。
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