题目

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 答案：A 解析: 根据语境得知牛顿的一次发现是泛指，应用不定冠词；man表示“人类”，其前不用冠词。

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