单项选择题

A．Something made of either metal or paper.
B．Pieces of metal.
C．Printed notepaper.
D．Something useful for starving travelers.
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单项选择题
A．On short trips.B．On long trips.C．When flying over cities.D．When flying at high altitudes.
A．On short trips.
B．On long trips.
C．When flying over cities.
D．When flying at high altitudes.
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