单选题：It can be found from the last paragraph that infrasonic wave

题目分类：理工类
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题目内容：

It can be found from the last paragraph that infrasonic waves __________. A．are harmless to people's health
B．exist in people's internal organs
C．can be used as deadly weapons
D．can improve eyesight

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分类：理工类题型：单选题

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