单项选择题

A．For hunting.
B．For amusement.
C．For protection against robbery.
D．For companionship.
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单项选择题
A．To show the key role played by air traffic controllers.B．To show the great responsibility shouldered by the pilots.C．To give an example of air disasters.D．To show that air travel is far safer than driving a car.
A．To show the key role played by air traffic controllers.
B．To show the great responsibility shouldered by the pilots.
C．To give an example of air disasters.
D．To show that air travel is far safer than driving a car.
单项选择题
A．Horsemen.B．Brass doors.C．Drops of water.D．Metal balls.
A．Horsemen.
B．Brass doors.
C．Drops of water.
D．Metal balls.
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