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【题目】While he was investigating ways to improve the telescope, Newton made ________ discovery which completely changed _________ man’s understanding of color.

A. the; a B. a ; the

C. a; 不填 D. 不填;the

【答案】C

【解析】句意:当牛顿在调查改进望远镜的方法时,他做出了一个彻底改变人类对色彩认识的发现。make a discovery做出发现,发现第一空指具体的一项发现;第二空后的man表示 “人类”, 前面要省略冠词故选C。

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