Modern medicine has increased man's life（）.

Modern medicine has increased man's life（）.
A、length
B、span
C、longtide
D、space
【正确答案】：B
【题目解析】：length一般指物体的长度；span跨度，范围；longitude经度；space空间，距离；life span指寿命。本题句意为：现代医学延长了人的寿命。因此应选B