In dealing with public relations，we should make every effort to prevent the_______in personality.

A．conflict

B．contrast

C．contract

D．concern

关于肝内胆管细胞癌的叙述，错误的是（）.

A.多见于60岁以上

B.血供多丰富

C.与肝硬化无关

D.胆管及肝外门脉阻塞常见

E.发现时肿瘤通常较大