问题
选择题
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
答案
答案：D
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。