----Jack, is maths difficult to learn in High school?

----Sure. No subject can be learned well __________hard work.

A．without

B．through

C．by

D．with

波动性无痛性黄疸伴肝及胆囊肿大者，B超显示肝内外胆管扩张。最可能的诊断为

A．肝癌

B．黄疸性肝炎

C．壶腹周围肿瘤

D．胆道蛔虫症

E．胆总管囊肿