身高1.7m的人站在1m高的竖直平面镜前3m处，他在镜中的像高是 m，像和他相距________m。
1.7，6
If you are hunting chance to improve yourself in English, I think the English corner will
be ________smart choice.[ ]
A. a; a
B. a; the
C. the; a
D. the; the
