Paragraph 5 __________

A．The main components of the maglev train system

B．High-speed maglev due to zero friction

C．The working principle of the maglev train

D．Differences between polarity and magnetic field

E．Comparison of maglev trains with traditional ones

F．Maglev with a powerful motor

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参考答案

第五段比较详细地介绍了为什么磁浮列车会向前运动，也就揭示了磁浮列车的工作原理。C项中说working principle是正确的。

1 Paragraph 6 __________

A．The main components of the maglev train system

B．High-speed maglev due to zero friction

C．The working principle of the maglev train

D．Differences between polarity and magnetic field

E．Comparison of maglev trains with traditional ones

F．Maglev with a powerful motor

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2 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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3 You can connect a wire to the positive and negative ends of a battery __________.

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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