听力原文:W: So you have heard Professor Johnson's lectures before, right? What do you thin
M: Well, let me put it this way: I could never stay awake in one of his classes without first drinking a cup of coffee.
What does the man imply?
(14)
A.One needs to drink a end of coffee before the professor's class.
B.He knows Professor Johnson.
C.The professor's classes are in the early morning.
D.The professor's classes are extremely boring.