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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单项选择题
Domestic noises may perhaps be controlled by______.
A．good planning and technical improvement
B．preventing fast motorcycles and heavy lorries from passing through residential districts
C．being considerate and polite
D．signing international agreements on the noise control measures
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