An accident happened at ____ crossroads a few metres away from ____ bank.

A．a; a

B．不填；a

C．不填；the

D．the; 不填

肠重复畸形的好发部位为以下哪一项（）

A.空肠

B.回盲部

C.十二指肠

D.空回肠

E.结肠