While he was investigating ways to improve the telescope, Newton made ______ discovery 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:

根據(jù)語境得知牛頓的一次發(fā)現(xiàn)是泛指，應(yīng)用不定冠詞；man表示“人類”，其前不用冠詞。

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