听力原文：M: How long can I keep the book？W: Three weeks, but you can renew it if you need

听力原文：M: How long can I keep the book？

W: Three weeks, but you can renew it if you need it for a longer time.

Q: What is the possible relationship between the speakers？

(13)

A．Professor and student.

B．Shop assistant and customer.

C．Librarian and reader.

D．Two friends.