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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单项选择题
Noise pollution can cause （）

A．lower productivity
B．lower blood pressure
C．sound sleep
D．less stress
单项选择题
From the passage we know in America the principle of customer service is （）

A．to be fast and convenient
B．to make customer the center of attention
C．to be the first in the world
D．to make the customer feel at home
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