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．Authority.B．A good relationship.C．Good luck.D．Independence.
A．Authority.
B．A good relationship.
C．Good luck.
D．Independence.
单项选择题
A．The bacteria would be killed by the human immune system.B．The bacteria would die if brought to the surface.C．Many antidotes and remedies are available.D．Drilling operations are always closely monitored.
A．The bacteria would be killed by the human immune system.
B．The bacteria would die if brought to the surface.
C．Many antidotes and remedies are available.
D．Drilling operations are always closely monitored.
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