A、Buying an airplane ticket. B、Checking in at an airline terminal. C、Sending some packages. D、Passing the Customs. B由“Check in h

M: Check in here?
W: Yes.
M: Can I see your ticket, please?
W: Here it is, I’m going to Los Angeles.
M: Smoking or nonsmoking?
W: Nonsmoking. And can I get a seat at the back?
M: All right. That’s 28-d. Put your bag on the scale, please.
W: Sure.
M: I’ll