【題目】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：當(dāng)牛頓在調(diào)查改進(jìn)望遠(yuǎn)鏡的方法時(shí)，他做出了一個(gè)徹底改變?nèi)祟?lèi)對(duì)色彩認(rèn)識(shí)的發(fā)現(xiàn)。make a discovery做出發(fā)現(xiàn)，發(fā)現(xiàn)，第一空指具體的一項(xiàng)發(fā)現(xiàn)；第二空后的man表示 “人類(lèi)”, 前面要省略冠詞。故選C。

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