题目内容
（请给出正确答案）
[主观题]
A．To show the key role played by air traffic controllers.B．To show the great responsib
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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