单项选择题

When you post a letter, you must buy ______.

A．a ten - fen stamp
B．a new stamp
C．a twenty - fen stamp
D．a stamp worth 10 fen or more
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单项选择题
The post office says the stamp is useless when ______.
A．you buy it
B．you write a letter
C．put a letter into a postbox
D．it has a postmark on it
单项选择题
Which of the following statements is true
A．Grown - ups like new stamps while young boys like used ones.
B．There are hundreds of kinds of stamps in the world.
C．Sometimes stamp collectors are willing to pay thousands of yuan or more for a used stamp.
D．A post - office worker does not want to buy any used stamps.
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