In science fiction we read of flying saucers travel through _____ space, so people want to have ______ better knowledge of the universe.
A．the; aB．/; /C．the; /D．/; a
D
space作“太空；空間”講時(shí)，是不可數(shù)名詞，前不需冠詞。have a knowledge of 意為“對……理解/ 熟悉”。如：He has a good knowledge of politics.（他對政治非常熟悉）。故D是正確答案。
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