单选题
Besides its main use the noise-killing system can______.
A、
make a car lighter
B、
make a car quieter
C、
reduce the cost of a silencer
D、
improve the performance of a silencer
【正确答案】
A
【答案解析】
[考点] 细节题
[解析] 通过文章第四段Another good thing about the use of noise-killing systems is that it saves the need for a silencer；this not only reduces the weight of a car．．．得知。
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