单项选择题
[听力原文]6-7
W: May I see your ticket and passport, please
M: Here they are. Will you be weighing all my baggage together
W: Yes, would you put it all on the machine, please
M: Okay.
W: Ah, nineteen kilos.
M: Does that mean it is inside the free allowance
W: Yes, you’re allowed twenty kilos.
M: That’s lucky!
A．Customer and shop assistant.
B．Customer and ticket-seller.
C．Boss and secretary.
D．Customer and airplane clerk.