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．They are less intelligent.B．They are less moral.C．They are more numerous.D．They often speak a non-English language at home.
A．They are less intelligent.
B．They are less moral.
C．They are more numerous.
D．They often speak a non-English language at home.
单项选择题
A．It’s not always clear why people behave in certain ways.B．People usually blame others for their mistakes.C．Certain conditions cause drivers to behave strangely.D．The reason for some behavior is Obvious.
A．It’s not always clear why people behave in certain ways.
B．People usually blame others for their mistakes.
C．Certain conditions cause drivers to behave strangely.
D．The reason for some behavior is Obvious.
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