Although vehicles are becoming more and more important as the means of transport in modem life, why do they also cause many prob

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问题 Although vehicles are becoming more and more important as the means of transport in modem life, why do they also cause many problems?
If the ozone layer is destroyed by car, what will happen?

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答案The sunray will (be harmful to people and) cause cancer.

解析 根据题中的ozone我们可以知道这是有关第二个问题的,所以见第二段4-5句。
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