Salt spread on road in winter may cause all the following problems except ______. According to the author, when can CMA be appl

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问题 Salt spread on road in winter may cause all the following problems except ______.
According to the author, when can CMA be applied to the road?

选项 A、In the near future.
B、Right now.
C、After its cost halved.
D、Cannot tell from the passage.

答案D

解析课文说CMA开始受到人们的青睐，并有望在以后取代盐，但具体何时投入使用，并未说明，只说在研究之中，因此可选D。

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