单项选择题

A．Language.
B．Culture.
C．Misinterpretation.
D．Disagreement.
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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.
单项选择题
A．He was pleased.B．He was depressed.C．He did not know what to do and was confused.D．He found himself helpless.
A．He was pleased.
B．He was depressed.
C．He did not know what to do and was confused.
D．He found himself helpless.
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