While hewas investigating ways to improve the telescope, Newton made _________ discoverwhich complet

While hewas investigating ways to improve the telescope, Newton made _________ discoverwhich completely changed______ man’s understanding of color.

A.a; 不填

B.a; the

C.不填; the

D.the; a

答案及解析： A

解析：

考查冠词的用法。第一空表示泛指。