—Sorry, sir. I made a mistake again.

—________. Practise more and you’ll do better.

A．Never mind

B．Don’t mention it

C．I’m not sure

D．You’re welcome

最容易发生骨折的面骨是

A．颧骨

B．颧弓

C．上颌骨

D．下颌骨

E．鼻骨