听力原文：W: Personnel Department.
M: Hello. Could I speak to Mr. Smith, please？
W: I'm afraid he's not at his desk now.
M: Do you know when he'll be back？
W: About three-thirty, I think. Can I take a message？
M: Yes. Could you tell him Mike Jackson called？ I'll call again later.
W: Mr. Jackson, I will tell him.
Mt Thank you. Bye-bye.
A．The Personnel Department.
B．The Marketing Department.
C．The Production Department.
D．The R&D Department.