-Sir, would you mind not _____ here, please?

-Sorry.

A．to smoke

B．smoke

C．smoking

D．smoked

输尿管结石最易嵌顿于（）

A．输尿管与肾盂相接处

B．与睾丸血管交叉处

C．输尿管穿膀胱壁内处

D．输精管越过输尿管下端的前方处

E．越过小骨盆入口处