细菌性肝脓肿的主要感染途径包括（）
A.胆道
B.肠系膜上静脉
C.肝总动脉
D.下腔静脉
E.直接蔓延
参考答案：A, B, C, E
—Who is the most ___________ student in your class?
—I think Jimmy is. He is very out going, helpful and creative.
A．popular
B．clever
C．friendly
D．patient
叉车的性价比高，则经济效益好。
