14．While he was investigating ways to improve the telescope Newton made _______discovery which completely changed ____ man's understanding of color．（　　）
A．a，/B．a，theC．/，theD．the，a

分析 當(dāng)他在研究改進(jìn)望遠(yuǎn)鏡的方法時(shí)，牛頓做出一個(gè)重大的發(fā)現(xiàn)，這徹底地改變了人類對(duì)色彩的理解．

解答 答案選A．本題考查冠詞的用法．前半句是由while引導(dǎo)的時(shí)間狀語從句"While he was investigating ways to improve the telescope"，主句為"Newton make ___ discovery"，之后是由which引導(dǎo)的定語從句，修飾discovery．第一空后的discovery是可數(shù)名詞的單數(shù)形式，意為"發(fā)現(xiàn)"，本句話中第一次提到，為泛指"一個(gè)發(fā)現(xiàn)"，又因discovery以輔音音素[d]開頭，故用a．第二空后的man指代"人類"，其前不用冠詞．

點(diǎn)評(píng) 長(zhǎng)難句注意劃分句子成分，分清主句從句．man指"人類"時(shí)，其前不用冠詞．

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