单项选择题

A．They will remain where they are.
B．They will leave this area for ever.
C．They will turn to experts for advice.
D．They will seek shelter in nearby regions.
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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.
单项选择题
Two different points are made in the essay about the efficient use of land, one of them is that some countries use old-fashioned methods of cultivation and therefore get a low yield, the other point is the certain kinds of food require more land than others.
A．Y
B．N
C．NG
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