Salt spread on road in winter may cause all the following problems except ______. Why is CMA favoured to salt? Because _______.

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问题 Salt spread on road in winter may cause all the following problems except ______.
Why is CMA favoured to salt? Because _______.

选项 A、it is less expensive
B、it has minimal adverse effect
C、people like it better than salt
D、highway departments want to have a change

答案B

解析 从作者的叙述可以知道,CMA的造价较高,但它的副作用最小,从长久考虑,是比盐更合适的选择,因此人们才开始青睐于CMA。
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