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Exploring ________space is exciting, yet dangerous. There is ________need for both robots and humans for space exploration.
A．the; aB．a; aC．/; aD．/; the
C

試題分析：句意：探索太空是令人興奮的，然而也是危險的，太空探索即需要機器人也需要人類。第一空不填，space是抽象名詞，第二空填a，There is a need for..“有…需求”，所以選C。
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