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．Love can lead to a lot of hurt feelings.B．Love can lead to a lot of quarrels.C．Love can lead to a lot of bitterness.D．Friends are very important.
A．Love can lead to a lot of hurt feelings.
B．Love can lead to a lot of quarrels.
C．Love can lead to a lot of bitterness.
D．Friends are very important.
单项选择题
A．Food for the Friday night cookout.B．Tent for sleeping out.C．Drinks for all day Saturday.D．A bathing suit and a sleeping bag.
A．Food for the Friday night cookout.
B．Tent for sleeping out.
C．Drinks for all day Saturday.
D．A bathing suit and a sleeping bag.
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