◎ 题干
While he was investigating ways to improve the telescope, Newton made      discovery which completely
changed          man's understanding of color.
[     ]
A. a; /              
B. a; the            
C. /; the          
D. the; a
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“While he was investigating ways to improve the telescope, Newton madediscovery which completely changedman's understanding of color.[ ]A. a; /B. a; theC. …”主要考查了你对  【不定冠词】【定冠词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。