Flyashcanpartlytaketheplaceof______.
A.pavingmaterial
B.cement
C.concrete
D.thecoalby-product
正确答案:B答案为B。根据第一段倒数第二句,andcanreplaceupto20percentofthecementusedinconcrete,"replace"相当于“taketheplaceof”

Flyashcanpartlytaketheplaceof______.
A.pavingmaterial
B.cement
C.concrete
D.thecoalby-product
正确答案:B上一篇 An aspiring reporter must learn to ______.A. be sure his facts are accurate B. report
下一篇 A cub reporter is another name for a ______.A. copyboy B. campus reporter C. newsp