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
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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
单项选择题
It is implied that the solution to noise problem may be______.
A．money-consuming
B．not existing
C．time-consuming
D．better planning
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