While he was investigating ways to improve the telescope, Newton made______ discover which completely changed______man’s understanding of colour.

A. a…不填    B. a…the      C. 不填…the    D. the…a

 

A

【解析】第一空指具體一項發(fā)現(xiàn)；man這里表示 “人類”, 前邊要省略冠詞。

 

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