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.
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单项选择题
A．She has finished only one step.B．She doesn’t have any more time for redecorating.C．It’s time for the work to be finished.D．The redecorating is being done gradually.
A．She has finished only one step.
B．She doesn’t have any more time for redecorating.
C．It’s time for the work to be finished.
D．The redecorating is being done gradually.
单项选择题
A．For hunting.B．For amusement.C．For protection against robbery.D．For companionship.
A．For hunting.
B．For amusement.
C．For protection against robbery.
D．For companionship.
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