—I was worried about my math，but Mr．Brown gave me an A. —______________.

A．Don’t worry about it．    

B．Congratulations! That’s a difficult course．

C．Mr．Brown is very good．

D．Good luck to you!

股骨下1/3骨折可出现（）

A.肱动脉损伤

B.腘动脉损伤

C.尺神经损伤

D.桡神经损伤

E.股骨头缺血性坏死