单项选择题

According to the first paragraph, noise is______.

A．inseparable from leisure
B．inseparable from by-product
C．inseparable from working hours
D．inseparable from the advance of our life
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单项选择题
Noise control demands the following factors except______
A．sense of proportion
B．money and technology
C．conflict of interest
D．self-discipline
单项选择题
The best way to solve the noise problem is to______.
A．stop using machines
B．make vehicles soundless
C．put something~ in your ears
D．prevent it from reaching human ears
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