— Why isn't your sister at school today?

— Because ______________.[ ]

A. she's late

B. he's ill

C. she has a fever

胆囊切除术时，胆总管探查指征是（）。

A.胆总管扩张

B.胆囊积液

C.胆囊多发性小结石

D.胰腺炎

E.黄疸病史