—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

巴戟天药材外皮横向断裂而露出木心（木质部），因其形状被习称为（）

A.鸡眼

B.田鸡头

C.鸡爪形

D.鸡肠风

E.鸟喙状