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
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
单项选择题
A．Because their wives didn’’t like it.B．Because it wasn’’t good for cooking.C．Because their wives didn’’t like the flavor.D．All of the above.
A．Because their wives didn’’t like it.
B．Because it wasn’’t good for cooking.
C．Because their wives didn’’t like the flavor.
D．All of the above.
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