听力原文:W:Professor Li,I am so sorry to disturb you by asking you so many questions after
M:Tired? There is nothing more interesting than helping my students solve the problems in the study.
Q:What is man's attitude towards answering these questions after class?
(19)
A.It is very boring.
B.It is very interesting.
C.It is a waste of time.
D.It is his responsibility.