单选题 Sometimes it is impossible to send all the mail that arrives at the post office. Perhaps there is an inadequate or illegible address and there is no return address. The post office cannot just throw the mail away, so it becomes "dead mail". Dead mail is then sent to one of the U.S. Postal Service's dead mail offices in Atlanta, New York, Philadelphia, St. Paul, and San Francisco. Seventy-five million pieces of mail can end up in these offices in one year.
The staff 'of the dead mail offices has different ways to deal with all of these pieces of dead mail. First of all, they look for clues that can help them deliver the mail; they open packages in the hope that something inside will show where the package came from or is going to. (43) Dead mail will also be listed on a computer so that people can call in and cheek to see if a missing item is there.
However, all of the mail cannot simply be stored forever: there is just too much of it. When a lot of dead mail has piled up, the dead mail offices hold public auctions. Every three months, the public is invited to the offices and containing items found in dead mail packages are sold to the highest bidder (出价人).

单选题 Which of the following is NOT mentioned as a way to deal with dead mail?
A. To search for clues. B. To throw dead mail away.
C. To open dead mail. D. To list dead mail on a computer.

单选题 The staff in a dead mail office may open a package in order to find______.
A. some money B. some missing objects
C. an address D. a computer

单选题 The passage indicates that dead mail auctions are held______.
A. once a year B. twice a year
C. three times a year D. four times a year

单选题 The underlined word "clue" may probably mean______.
A. a postman that knows where to send the letter
B. an officer that knows the one who sent the letter
C. some stamps that are left in the envelope
D. some information that helps to find the receiver of the letter

单选题 Which is the best title for the passage?
A. Dead Mail B. Mail Auction
C. Unknown Mail D. The Dead Mail Office