单项选择题

Noise pollution can cause （）

A．lower productivity
B．lower blood pressure
C．sound sleep
D．less stress

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

A．Objects.
B．Intensity.
C．Rate.
D．Frequency.
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