单项选择题

A．however
B．therefore
C．indeed
D．after all
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单项选择题
A．anyB．oneC．anotherD．no
A．any
B．one
C．another
D．no
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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