单项选择题

A．Technology site.
B．Medical care site.
C．Financial site.
D．Ethnic problents site.
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单项选择题
A．She is tired of doing homework.B．She finds it hard to fall asleep.C．She is used to staying up all night.D．She has to finish her homework first.
A．She is tired of doing homework.
B．She finds it hard to fall asleep.
C．She is used to staying up all night.
D．She has to finish her homework first.
单项选择题
A．To show that air travel is far safer than driving a car.B．To show the great importance of the pilots.C．To give an example of air disasters.D．To show the key role played by air traffic controllers.
A．To show that air travel is far safer than driving a car.
B．To show the great importance of the pilots.
C．To give an example of air disasters.
D．To show the key role played by air traffic controllers.
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