单项选择题

蛭弧菌与细菌的关系属于：( )
A．竞争 B．互生关系 C．寄生关系 D．共生关系

A.竞争
B.互生关系
C.寄生关系

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听力原文：W: Hi, John. I haven't seen you since we were at the university.
M: That's right. You took business administration, didn't you'?
Q: What is the relationship between the two speakers?
(4)
A．They were schoolmates.
B．They are very good friends.
C．They were both businessmen years ago.
D．They are professors of a certain university.

A.
M:
B.They
C.
B．They
D.
C．They
E.
D．They
F.