All the clothes donated by the citizens need cleaning thoroughly before being sent to the earth-stricken area, ______ ?

A．needn’t they

B．don’t they

C．didn’t they

D．shouldn’t they

泌尿系造影常用的X线检查方法是

A．膀胱造影

B．肾动脉造影

C．逆行肾盂造影

D．静脉尿路造影

E．腹膜后充气造影