单项选择题

A．coupons
B．bank notes
C．trading stamps
D．packets
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单项选择题
A．A first-class letter.B．Urgent mail.C．A railway letter.D．An airway packet.
A．A first-class letter.
B．Urgent mail.
C．A railway letter.
D．An airway packet.
单项选择题
A．Unregistered mail.B．Recorded delivery.C．Registered delivery.D．Urgent mail.
A．Unregistered mail.
B．Recorded delivery.
C．Registered delivery.
D．Urgent mail.
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