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Why could American economy become the strongest in the world

【参考答案】

Because of spectacular scientific and technological advances
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What does success mean for Americans
单项选择题
A．To show that air travel is far safer than driving a car.B．To show the great responsibility shouldered by the pilots.C．To give an example of air disasters.D．To show the key role played by air traffic controllers.
A．To show that air travel is far safer than driving a car.
B．To show the great responsibility shouldered by the pilots.
C．To give an example of air disasters.
D．To show the key role played by air traffic controllers.
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