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问题

Fly ash can partly take the place of _


Fly ash can partly take the place of ______.

  • A paving material
  • B cement
  • C concrete
  • D the coal by-product
参考答案
参考解析:

答案为B。根据第一段倒数第二句,and can replace up to 20 percent of the cement used in concrete, "replace"相当于“take the place of”

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