Question

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

A．a; 不填

B．a; the

C．不填; the

D．the; a

Answer 1

A

根据语境得知牛顿的一次发现是泛指，应用不定冠词；man表示“人类”，其前不用冠词。