Which of the following gives a general idea of how the noise-killing system work

游客2025-07-31 12

问题 Which of the following gives a general idea of how the noise-killing system works? [br] The noise-killing system is not yet popular mainly because ______.

选项 A、it is still being tried out
B、drivers still have their doubts
C、it increases the cost of car production
D、carmakers are not sure if it is necessary

答案 C

解析从文章最后一段最后一句But the carmakers haven’t decided if they will carry it into production because it would add several hundred dollars to the cost of their cars．得知。

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Which of the following gives a general idea of how the noise-killing system work

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