单项选择题

A．At the airport.
B．By plane.
C．Taking the air.
D．On radio and TV.
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单项选择题
A．To test students through computers.B．To store statistics about students.C．To help professors do research work.D．To aid students in registration.
A．To test students through computers.
B．To store statistics about students.
C．To help professors do research work.
D．To aid students in registration.
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