2. 职称英语
  3. Which of the following gives a general idea of how the noise killing system work

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

游客2025-07-29  30
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 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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