单项选择题

A．air traffic problems.
B．safety improvement.
C．the number of flights.
D．flight training courses.
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单项选择题
The man say that he is unable to________.
A．plan a birthday party
B．sleep during the day
C．type his own term papers
D．work well under pressure
单项选择题
A bride can ________if she finds her marriage gift useless.
A．ask for another gift
B．exchange it for something useful
C．return it to the giver
D．just keep it
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