Fly ash can partly take the place of ______.
- A paving material
- B cement
- C concrete
- D the coal by-product
问题
Fly ash can partly take the place of _
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”
分类：其他
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