为确诊进一步检查应首选

A．白细胞计数和分类

B．腹部X线平片

C．B超和腹部CT

D．ERCP

E．经皮肝穿刺胆管造影(PT

Please pass me the dictionary ______ cover is made of plastics.

A．whose

B．of which

C．that

D．which