单项选择题

A．At 9:00.
B．At 9:30.
C．At 7:30.
D．At 8:00.
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单项选择题
A．To deposit the money in a bank.B．To buy municipal bonds.C．To spend as he wants.D．To invest some of them.
A．To deposit the money in a bank.
B．To buy municipal bonds.
C．To spend as he wants.
D．To invest some of them.
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.
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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