Cement is produced (commercially) by (to heat) a mixture of limestone and clay (in a) large,(slowly rotating) cylindrical furnac

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问题 Cement is produced (commercially) by (to heat) a mixture of limestone and clay (in a) large,(slowly rotating) cylindrical furnace.

选项 A、commercially
B、to heat
C、in a
D、slowly rotating

答案B

解析

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