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．Learn more grammar and vocabulary.B．Watch more BBC television programs.C．Understand Spanish cultures well.D．Do more practice in speaking Spanish.
A．Learn more grammar and vocabulary.
B．Watch more BBC television programs.
C．Understand Spanish cultures well.
D．Do more practice in speaking Spanish.
填空题
abroad
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