单项选择题

A．On short trips.
B．On long trips.
C．When flying over cities.
D．When flying at high altitude.
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单项选择题
A person in cities is more likely to spend more money than one in suburban or rural areas.
A．Y
B．N
C．NG
单项选择题
A．The population of elderly people.B．Nuclear weapon.C．Violence in crime.D．Living standards.
A．The population of elderly people.
B．Nuclear weapon.
C．Violence in crime.
D．Living standards.
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