听力原文:W: How many books are required for the class?M: Only three, but the instructor ha
听力原文:W: How many books are required for the class?
M: Only three, but the instructor has suggested a lot of supplementary materials.
Q: What is the probable relationship between the two speakers?
(13)
A.Librarian and student.
B.Fellow professors.
C.Fellow students.
D.Professor and student.