单项选择题

This passage is mainly about _______.

A．different kinds of stamps in different countries
B．an organization that makes rules
C．international mail
D．the size and weight of letters
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单项选择题
We can learn from the text that ______.
A．mail is important to all countries
B．not enough letters are sent all over the world
C．all the international letters must be sent to Switzerland first
D．some stamps look very beautiful
单项选择题
Which statement is true according to the text
A．Countries around the world need each other's help.
B．Most people do not put enough postage on letters.
C．It is not possible for letters to get lost on the way.
D．Some of the letters are too large to be put into the mailbox.
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