Which of the following gives a general idea of how the noise-killing system works? Besides its main use the noise-killing syste

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问题 Which of the following gives a general idea of how the noise-killing system works?
Besides its main use the noise-killing system can ______.

选项 A、make a car lighter
B、make a car quieter
C、reduce the cost of a silencer
D、improve the performance of a silencer

答案A

解析细节题。根据文章第四段可知。所以[A]正确。

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