题目内容

高处作业分为四级，分别是1级、2级、3级和特级，其中2级是指( )m。

A. 2～5
B. 5～15
C. 15～30
D. 30

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Headset stereos can ______.

A. cause hearing loss
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C. make people become mad
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A. shall be learning
B. are learning
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B. the goods you ordered
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