脐上2cm相当于____椎体水平。
参考答案：第3腰椎
— ________?
— He is very clever.[ ]
A. Who is the boy
B. What does the boy do
C. What's the boy like
D. What does the boy do
城市用地规模常常从属于人口规模，所以一般讲城市规模常常是指城市人口的多少。( )
