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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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.

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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