—There'll be many beautiful pictures _____ in the hall this Sunday.       

—Let's go and have a look.       [ ]

A. on duty                    

B. on vacation      

C. on display                  

D. on board

易发生缺血坏死的是

A．股骨颈骨折
B．股骨干骨折
C．肱骨髁上骨折
D．胫骨下1/3骨折
E．腓骨中段骨折