单项选择题
W: Good morning.
M: Good morning. What can I do for you
W: I’d like a ticket to Pittsburgh, please.
M: Round trip
W: No. One way.
M: Okay. That’ll be twenty-two dollars.
W: Twenty-two Last time ! took this bus it was only twenty.
M: I know. The rates went up this month.
W: Just like everything else.
M: Yeah.
A．A half-price ticket.
B．A one-way ticket.
C．A round-trip ticket.