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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 net yet popular

Which of the following gives a general idea of how the noise-killing system works? The noise-killing system is net yet popular

admin2008-12-15  89
问题 Which of the following gives a general idea of how the noise-killing system works?
The noise-killing system is net 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 cats．得知。
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