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  3. Sometimes it is impossible to send all the mail that arrives at the post office. Perhaps there is an inadequate or illegible add

Sometimes it is impossible to send all the mail that arrives at the post office. Perhaps there is an inadequate or illegible add

admin2010-01-12  50
问题    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).
The passage indicates that dead mail auctions are held______.
选项 A、once a year
B、twice a year
C、three times a year
D、four times a year
答案D
解析
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