摘要:While he was investigating ways to improve the telescope,Newton made discover which completely changed man’s understanding of color. A.a,/ B.a,the C./,the D.the,a 解析:“偶然的一个发现 用a,“改变了人们对颜色的观念 .understanding为抽象名词.其前面习惯上不用冠词. 答案:A

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