What is the main idea of the passage?
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1 .Paragraph 6 _________
A The Main omponents of Maglev Train System B High-speed Maglev due to Zero riction 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
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
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
4 .A unique system of magnetic fields is created by the coils _______.
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
5 .The frictionless maglev train enables you ___________.
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
7 .Why mice are described in the passage as “creatures of the night” because they are____.
A frightening to many people B hunted by birds C studied while in hibernation D active after dark
8 .Which of the following is NOT mentioned in the first as a reason for popular interest in birds?
A Their ecological value B Their appealing habits C Their visibility D Their beauty
9 .“They” in the second paragraph refers to __________.
A ornithology and general biological science B contributions C professional biologists D birds
10 .David Lack’s research contributed to biological science specifically in the area of ____.
A evolution B mating behavior C animal demography D immunology
