Exploring space is exciting, yet dangerous. There is need for both robots and humans for

Exploring space is exciting, yet dangerous. There is need for both robots and humans for space exploration.
A. the; a
B. a; the
C. /; a
D. /; /

A. the; aB. a; the(答案→)C. /; aD. /; /解析：考查冠词：第一空不填，space是抽象名词，前面不接冠词，第二空填a，There is a need for sth需要…，句意：探索太空是令人兴奋的，但也是有挑战的，太空探险即需要机器人也需要人类，选C。

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