单项选择题

A．On short trips.
B．On long trips.
C．When flying over cities.
D．When flying at high altitudes.
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单项选择题
A．He will not be able to marry Cindy.B．He has financial problems.C．He has yet to buy furniture.D．He may not be recovered until the weddin
A．He will not be able to marry Cindy.
B．He has financial problems.
C．He has yet to buy furniture.
D．He may not be recovered until the weddin
单项选择题
A．A lack of available flights.B．Long delays at the airport.C．When flying over cities.D．When flying at high altitudes.
A．A lack of available flights.
B．Long delays at the airport.
C．When flying over cities.
D．When flying at high altitudes.
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