Across North China _____ in the world, namely the Great Wall.[ ]

A. the longest wall runs

B. runs the longest wall

C. does run the longest wall        

D. does the longest wall run

目前治疗输尿管结石的方法有（）

A.体外冲击波碎石术

B.输尿管镜取石术

C.肾镜取石术

D.腹腔镜取石术

E.输尿管切开取石术