单选题：Several countries in the world are using strong electromagne

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题目类型：单选题
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题目内容：

Several countries in the world are using strong electromagnets __________. A．to develop a maglev train rail system
B．to explain why maglev trains are faster
C．to pull and push the train forward
D．to create a magnetic field
E．to experiment with the maglev train
F．to travel from Paris to Rome in about two hours

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分类：综合类题型：单选题