单项选择题

What's about the specialists' advice on buying a dog

A．It is very different from the common sense.
B．It can be easily got in the newspaper.
C．It is very useful to help you choose dogs.
D．It is difficult to follow the specialists' advice.

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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.