单项选择题

A．It carries its own oxygen supply.
B．It does not need any oxygen during the flight.
C．It can produce oxygen during the flight.
D．It extract oxygen from the air that flows through the engine.
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A．From his aunt.B．From Barbara.C．From charity organizations.D．Investment returns.
A．From his aunt.
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A．How to communicate effectively.B．Why successful communication are important.C．What communication is.D．How to avoid direct communication.
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