单项选择题

What can you do if you are not sure about the postage

A．You can buy stamps from machines.
B．You can buy different stamps of different prices.
C．You can ask the clerk for help.
D．You can put more stamps on the envelopes.

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单项选择题

There is ______ a post office in each town in Americ

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A post office sells ______ in Americ

A． stamps onlyB. only stamps and postcardsC. stamps and envelopesD. stamps, envelopes and postcards