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  3. Which of the following gives a general idea of how the noise killing system works? The noise killing system is not yet popular

Which of the following gives a general idea of how the noise killing system works? The noise killing system is not yet popular

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问题 Which of the following gives a general idea of how the noise killing system works?
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 car makers haven’t decided if they will carry it into production because it would add several hundred dollars to the cost of their cars可知，因为费用太高，所以没有打算投入生产。
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