单项选择题

Why were the two large jets specially mentioned

A．To show the key role played by the air traffic controller.
B．To show the great responsibility of 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

What is the growing danger in air travel according to this passage

A．Crowded air traffic.
B．The large size of airplanes.
C．Mistakes by air traffic controllers.
D．Bad weather.

单项选择题

What happened to the two large jets

A．They bumped into each other over a swimming pool.
B．They avoided each other by turning in different direction.
C．They narrowly escaped crashing into each other.
D．One plane climbed above the other at the critical moment.