—Mike hurt his leg while playing football yesterday.

—_____.[ ]

A. That's nothing

B. That's all right

C. Never mind

D. I'm sorry to hear that

梗阻性黄疸时，B超显示胆总管及以上胆管扩张，为明确梗阻部位首选的检查是

A．静脉法胆道造影

B．经皮肝穿刺胆道造影

C．内镜逆行胰胆管造影

D．核素扫描

E．上腹部CT