While he was investigating ways to improve the telescope, Newton made discovery which pletely changed man’s understanding of colour.
A. a; 不填
B. a; the
C. 不填; the
D. the; a
网友回答
(答案→)A. a; 不填
B. a; the
C. 不填; the
D. the; a
解析：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。