_________ the internet is _________, I do not think it is a good idea to spend too much time on it.

A．When ; helpful

B．As ; great help

C．While ; of great help

D．Now ; of no help

肝癌患者发生黄疸的原因中应除外（）

A.肝癌细胞侵入胆管内形成癌栓

B.肝癌压迫了肝胆管

C.肝癌晚期

D.肝功能衰竭

E.肝肿瘤的破坏