题目内容

完整的通知正文应由()等部分组成。
A受文单位名称
B通知缘由
C通知事项
D结束语

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It can_____(21)on both our physical and mental health and can lead to other health_____(22)

A. demands
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A. 5%
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A. if
B. how
C. where
D. what

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