单项选择题

Where can you find an area code map of the U. S.

A．On the first page of the telephone book.
B．At the end of the telephone book.
C．In the front of the white pages.
D．Right after the white pages.
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单项选择题
When you get a wrong number in making a long distance call, you are advised to ______.
A．hang up the receiver and call again
B．check the number and call again
C．tell the operator what has happened
D．ask the operator to put you through again
单项选择题
The speaker advises us to use the Earth's resources wisely because ______.
A．the Earth is heavily polluted
B．nature cannot recycle its resources
C．there are more and more people on the Earth
D．no more new resources can be added
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