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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

admin2008-12-15  64
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 细节题。根据文章最后一段第二句话“But the carmakers haven’t decided if they will put it into production because it would add several hundred dollars to the cost of their cars．”所以[C]正确。
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