填空题
A--air mail
B--date stamp
C--EMS
D---express delivery letter
E--letter box
F--please forward
G--post-office box
H--registered letter
I--sub-post office
J--telecommunications service
K--regular mail
L--mail order
M--mailing list
N--postage stamp
O---post-free
P--postage paid
( ) 日期邮戳 ( )请转发
【参考答案】
B、F