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

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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