问题
选择题
While he was investigating ways to improve the telescope Newton made _______discovery which completely changed ____ man’s understanding of color.
a ,/ B. a ,the C. /, the D. the ,a
答案
答案：A
make a discovery 有了一个发现；man’s understanding of color人类对于颜色的理解，在物主代词，名词所有格前，一般不用加冠词，man 用单数形式，前面不加冠词，可以表示“人类”。