单项选择题

A．Nature has changed our environment over the years.
B．We must avoid wasting resources and polluting our environment.
C．Our resources are nearly used up.
D．Trips to other planets will help eliminate pollution.
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单项选择题
A．To apply to study in America is quite easy.B．To apply to study in America is quite difficult.C．To apply to study in America is quite complicated.D．To apply to study in America is quite simple.
A．To apply to study in America is quite easy.
B．To apply to study in America is quite difficult.
C．To apply to study in America is quite complicated.
D．To apply to study in America is quite simple.
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.
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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