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. /; /
网友回答
A. the; a
B. a; the
(答案→)C. /; a
D. /; /
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。