问题补充：
I’m 1.70 metres. Yao Ming is 2.27 metres. I am Yao Ming.
A. as tall as
B. taller than
C. not as tall as
D. so tall as
答案：
A. as tall as
B. taller than
(答案→)C. not as tall as
D. so tall as
解析：C 根据句意知，我没姚明高。即，I am not as tall as Yao Ming =I am shorter than Yao Ming.
