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
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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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