They are working hard now and I believe they will make progress                more this time.    [ ]

A. slowly    

B. quietly    

C. politely    

D. quickly

横跨下腔静脉在肝门处进入肝脏的结构是()

A．肝静脉

B．胆总管

C．肝动脉

D．门静脉

E．胆囊管