胎儿时期脊髓末端的位置是（）

A．第1腰椎下缘

B．第2腰椎下缘

C．第3腰椎下缘

D．第4腰椎下缘

E．第5腰椎下缘

．--- Jack is really a brave guy.

--- So he is. And we can’t admire his courage ____________.

A．too much

B．a lot

C．very much

D．a little