听力原文:W: Prof. Li, a few of us at the back didn't get your copy of reading as assignment. M: Well, there're only 38 names on my class list. And I didn't bring any spare copies. What do we learn from the conversation?
A.
Some students at the back cannot hear the professor.
B.
The professor has changed his reading assignment.
C.
Some of the students are not on the professor's list.
D.
The professor has brought extra copies of his assignment.