As we all know mankind has realized the walk in space. A. the; theB. /; theC. /; /D. th

问题补充：

As we all know, mankind has realized the walk in space.

A. the; the

B. /; the

C. /; /

D. the; /

答案：

A. the; the

B. /; the

(答案→)C. /; /

D. the; /

解析：本题考查冠词。mankind做“人类”讲时，是集合名词，可用单数或复数，用单数时不加a；space为不可数名词,作其义时,前不加冠词。选C。

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