Salt spread on road in winter may cause all the following problems except ______. Which of the following statements about salt

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问题 Salt spread on road in winter may cause all the following problems except ______.
Which of the following statements about salt is Not True?

选项 A、For many years people have been unaware of the many problems of salt including its corrosive effects.
B、Salt is the cheapest among its many alternatives with its purchase price of $ 25 a ton.
C、The national bill of salt may reach as high as $ 5 billion a year.
D、The economic cost of salt is still lower than the cost of CMA.

答案A

解析第一段第二句即说明人们早就知道盐的腐蚀作用，但因为它便宜才忽视了其他问题。因此只有A的陈述是错误的，所以选A。

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