A. | a,/ | B. | a,the | C. | /,the | D. | the,a |
分析 当他在研究改进望远镜的方法时,牛顿做出一个重大的发现,这彻底地改变了人类对色彩的理解.
解答 答案选A.本题考查冠词的用法.前半句是由while引导的时间状语从句"While he was investigating ways to improve the telescope",主句为"Newton make ___ discovery",之后是由which引导的定语从句,修饰discovery.第一空后的discovery是可数名词的单数形式,意为"发现",本句话中第一次提到,为泛指"一个发现",又因discovery以辅音音素[d]开头,故用a.第二空后的man指代"人类",其前不用冠词.
点评 长难句注意划分句子成分,分清主句从句.man指"人类"时,其前不用冠词.
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