单项选择题
W：Do I need to put more stamps on this letter？It has to go to Los Angeles.
M：No，if it’s sent by ordinary mail.Express mail is faster，but more expensive.
W：Well，I’d like it to go as soon as possible.How much more would express mail be？
M：That’ll be $4.75，ma’am.I’ll just get you the extra stamps，if you’d like.
A．Whether she has any letters.
B．If she has used enough postage.
C．How soon a parcel will be delivered.
D．Where to find a mail box.