While he was investigating ways to improve the telescope, Newton made ______ discovery which pletely changed ______ man's understanding of colour.A.a; /B.a; theC./; theD.the; a
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A解析句意：牛顿在研究改进望远镜的方法时有一个发现，这一发现完全改变了人类对颜色的理解。discovery指具体的发现、发觉时，是可数名词。如：Scientists have made many important discoveries.科学家做出了许多重大发现。man作“人类”讲，用零冠词。