In science fiction we read of flying saucers travel through space, so people want to have better knowledge of the universe.
A. the; a
B. /; /
C. the; /
D. /; a
网友回答
A. the; a
B. /; /
C. the; /
(答案→)D. /; a
解析：space作“太空；空间”讲时，是不可数名词，前不需冠词。have a knowledge of 意为“对……理解/ 熟悉”。如：He has a good knowledge of politics.（他对政治非常熟悉）。故D是正确答案。