While he was investigating ways t improve the telescope Newton made discovery which pletely changed man’s understanding of color.
A. a ,/
B. a ,the
C. /, the
D. the ,a
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(答案→)A. a ,/
B. a ,the
C. /, the
D. the ,a
解析:make a discovery 有了一个发现;man’s understanding of color人类对于颜色的理解,在物主代词,名词所有格前,一般不用加冠词,man 用单数形式,前面不加冠词,可以表示“人类”。