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．Crime need to be treated as a disease.B．Primitive punishment will do no good.C．Severe punishment is necessary to stop crime.D．Primitive people had trouble with crime treatment.
A．Crime need to be treated as a disease.
B．Primitive punishment will do no good.
C．Severe punishment is necessary to stop crime.
D．Primitive people had trouble with crime treatment.
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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