听力原文:W: Professor Li, I'm so sorry to disturb you by asking you so many questions afte
M: Tired? There is nothing more interesting than helping my students solve the problems in the study.
Q: What does the man think of answering the woman's questions after class?
(13)
A.It is very boring.
B.It is very interesting.
C.It is a waste of time.
D.It is his responsibility.