单项选择题

How are noises made by industrial machines solved in working places（）

A．By adding sound proofing.
B．By planting vegetation.
C．By wearing ear protection.
D．By separating residential areas.

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单项选择题
What is most noise pollution damage concerned with（）

A．Objects.
B．Intensity.
C．Rate.
D．Frequency.
单项选择题
Where is the noise pollution most serious according to the passage（）

A．In streets.
B．In airports.
C．In subway stations.
D．In concerts.
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