While he was investigating ways to impro
题型:选择题
问题:
While he was investigating ways to improve the telescope, Newton made discovery which completely
changed man's understanding of color.[ ]
A. a; /
B. a; the
C. /; the
D. the; a
While he was investigating ways to improve the telescope, Newton made discovery which completely
changed man's understanding of color.[ ]
A. a; /
B. a; the
C. /; the
D. the; a