—The research on the new bird flu virus vaccine is challenging and demanding. Who do you think can do the job

— （） my students have a try

A. Shall

B. Must

C. Will

D. May

肱骨中1/3骨折，近端向外、向前，远端向上移位，是由于受何牵拉所致（）。

A.胸大肌

B.三角肌和喙肱肌

C.肱三头肌和肱二头肌

D.肱肌

E.背阔肌