单项选择题

According to the passage, intense noise pollution may NOT cause ______.

A．hearing loss
B．high blood pressure
C．lost productivity
D．poor appetite
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单项选择题
Which element determines the harm brought by the noise pollution
A．Frequency and intensity of the sound.
B．The time the pollution lasts.
C．The density of the population.
D．The quality of the sound.
单项选择题
Generally speaking, a rock concert takes place at about ______.
A．40 decibels
B．90 decibels
C．110 decibels
D．160 decibels
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