冠词While he was investigating ways to improve the telescope,N

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冠词
While he was investigating ways to improve the telescope,Newton made ( ) discovery which completely changed ( ) man's understanding of colour.
A a;x
B a;the
C x;the
D the;a
要理由

选择A
原因：
1,a discovery ：“a ”通常用在一个很具体的对象之前（此句的具体对象是“发现”（discovery）,而“the ”通常用来表示泛指对象.
2,man's understanding of colour 译成“人类对色彩的认识” .这里man's …… 是“人类”之意,是泛指,不是具体指某一个人,从英语表达习惯角度来讲,“人类（man's )”之前肯定不加"the ”.随你阅读经历增加,你一定会发现这一现象的.
祝好.

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