On April 1, the westerners will play ________ on each other but make sure that no one is hurt.[ ]

A．fun  

B．fool

C．jokes  

D．games

B超检查证实肾积水，IVP未能清除显示。若进一步检查，下列哪项不能直接显示肾积水

A．大剂量造影剂静脉连续滴注造影

B．推注造影剂后延迟24～36小时摄片

C．逆行肾盂造影

D．腹部X线平片

E．CT