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Though the ideal cure for noise is to stop it at its source,this may in many( )be impossible.The next remedy is to absorb it on its way to the ear.Domestic noises may by controlled by forethought and courtesy and industrial noises by good planning and technical improvement.

Acases

Bconditions

Cpresentations

Dcircumstances

正确答案:A (备注:此答案有误)

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