听力原文:M: Good morning. This is John Parker speaking. I'm just ringing to confirm my app
W: Yes. Mr. Smith is expecting you at 3 o'clock.
Why is the man making the phone call?
A.He wants to make an appointment with Mr. Smith.
B.He wants to make sure that Mr. Smith will see him.
C.He wants to change the time of the appointment.
D.He wants the woman to meet him at three o'clock.