单项选择题
[听力原文]8-10
W: Excuse me, sir. Can you tell me how much it costs to send an airmail letter to Paris
M: That’s one dollar if it is not overweight.
W: How about postcards
M: That will cost you 80 cents.
W: Well, will you first weigh this letter for me
M: OK. The letter is 10 grams overweight, Madam. You’ll have to pay 20 cents extra for the overweight.
W: Here you are. And I want to buy a 30 cent stamp.
M: Well. One 30 and 20 cents extra.., that will be $1.50 altogether.
W: Here’s $2.
M: OK. Here’s your change. Have a nice day!
W: Thank you!
A．40 cents.
B．30 cents.
C．50 cents.
D．20 cents.