填空题

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
A unique system of magnetic fields is created by the coils ______.

【参考答案】

C
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填空题
Paragraph 5 ______