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.
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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
单项选择题
All of the following are solutions employed to prevent noise pollution EXCEPT ______.
A．utilizing insulation and sound proofing devices
B．reducing the sources of noises
C．wearing ear protection
D．planting more trees to absorb the noise
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