【以ATrainFloatingOnAir为题目的英语阅读理-查字典问答网
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  【以ATrainFloatingOnAir为题目的英语阅读理解及其答案】

  以ATrainFloatingOnAir为题目的英语阅读理解及其答案

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2020-04-0801:29
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程宝雷

  ATrainFloatingOnAir

  Atrainthatfloatsonair?It'snotmagic—it'smagnets(磁).Andit'sclosetoreality.

  InVirginiaUSAthefallof2002,atrainwithnowheelstraveledonairandcarriedcollegestudentsacrosstheircampus.InJapan,awhisper-quietrailwayenginehoveredandracedat350milesperhourusingmagnetsandelectricityasthepower.AndinChina,amagnettrainlinelinkedShanghaiwithnearbyPudongAirport.

  Thesetrainsusemagneticlevitation(悬浮)technology,"maglev"forshort.Theyusethesamerulesasthemagnetsyoupickupathomeorschool:oppositepolesofmagnetsattracteachother,andlikepolesrepeleachother.

  Howdoesitwork?

  Powerfulmagnetsonthebottomofthetrainrepelmagnetsonthetrack,whichisactuallyjustamagnet-filledguidingway.Withamagneticfieldofsufficientforce,thetrainwillgohoveringonair,whichseemedimpossibletousinthepast.

  Whenanelectricalcurrentissentthroughthetrack,thetrainmoves.Turnthecurrentbackwardsandthetrainslowsdown.

  Maglevdoesn'trelyonthefriction(摩擦力)ofwheelsontrack,soitcanclimbamuchsteeperhillthanatraditionaltrain.Anditcantraveleasilyinsnowandice,somethingthatcouldbringnormaltrainstoascreamingstop.

  49.Thispassageisabout.

  A.maglevB.magnetsC.levitationD.electricity

  50.Whichofthefollowingisarepellingaction?

  51.Whatcanwelearnfromthetext?

  A.Amagnet-filledguidingwayisformedinsideamaglevtrain.

  B.Insteadofelectricity,magnetsareusedasthepowerofamaglev.

  C.Maglevtrainscanclimbhillswiththehelpofmagnetwheels.

  D.Electriccurrentsdecidethemovementsofamaglevtrain.

  52.Whatisthedifferencebetweenamaglevtrainandanordinarytrain?

  A..Amaglevtraincanclimbmountainswithoutpowerwhileanordinaryonecan't.

  B.Amaglevtraincantravelincollegecampuswhileanordinarytrainisnotallowed.

  C.Travellingwithoutatrack,amaglevtrainissaferandsmootherthananordinaryone.

  D.Floatingonatrack,amaglevtrainisfaster,quieterthananordinaryrailwaytrain.

  我帮你百度的,不知道是不是你想要的.

2020-04-08 01:34:26
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