观察膀胱有无病变可用（）
A.导尿检查
B. * * 扩张术
C. * * 膀胱镜检查
D.经 * * 输尿管肾镜检查
E.经皮肾镜检查
参考答案：C
Beyond the lake _____ quantities of birds coming from the North every winter.
A．flies
B．flying
C．flied
D．fly
How do you go there?[ ]
A. I'm going to buy a magazine about plants.
B. By bus.
C. I'm fine.
