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
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
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。