单项选择题

Headset stereos can ______.

A．cause hearing loss
B．cause mental disease
C．make people become mad
D．cause people become old
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单项选择题
Noise-induced hearing loss is ______.
A．apparent
B．rough
C．quick
D．unnoticed
单项选择题
According the experts, when headset sound reaches 110 decibcls, it can be used at most for ______.
A．one hour
B．half an hour
C．two hours
D．three hours
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