听力原文:W: I thought we could check out as many books as we need with a student ID. M: That's right, but not those reference books. Q: What does the man mean? (18)
A.
Students with a proper ID can check any book out.
B.
Only the students with special permission can check out reference books.
C.
Only professors can check out the reference books.
D.
The reference books are not allowed to be checked out.