Question

While he was investigating ways to improve the telescope, Newton made _______ discovery which completely changed _______ man’s understanding of colour.

A．a；/	B．a；the　?
C．/；the	D．the；a?

Answer 1

A?

discovery在表达“所发现的事物” 时是一个可数名词，由于没有说明这是什么样的发现，所以用不定冠词；man单独使用表“人类”，前面不加冠词。