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  Weallknowthatitisimpossibleforordinarypeopletomaketheirhomesontheequator(赤道)althoughoftentheymayfeeluncomfortablethere.Millionsdoit.ButasfortheNorthPoleweknowthatitisnotonlyadangerouslycoldpl

  Weallknowthatitisimpossibleforordinarypeopletomaketheirhomesontheequator(赤道)althoughoftentheymayfeeluncomfortablethere.Millionsdoit.ButasfortheNorthPoleweknowthatitisnotonlyadangerouslycoldplacebutalsothatpeoplelikeyouandmewouldfinditquiteimpossibletolivethere.Atthepresenttimeonlythescientistsandexplorerscandosoandtheyusespecialequipment.Menhavebeentravelingacrossandaroundtheequatoronwheelsontheirfeetorbyshipsforthousandsofyears;butonlyafewmenwithgreatdifficultyandinveryrecenttimehaveevercrossedtheicetotheNorthPole.SoitmaysurpriseyoutolearnthatwhentravelingbyairitisreallysafertoflyovertheNorthPolethanovertheequator.Ofcoursethisisnottrueaboutlandinginthepolarregion(whichpassengeraeroplanesdonotmake)buttheweatherifweareflyingataheightof5000metersabovethePoleisadelight.At4000metersandmoreabovetheearthyoucanalwaysbesurethatyouwillnotseeacloudintheskyasfarastheycanreachinthetropics(热带)ontheotherhandyouarenotcertaintokeepclearofbadweatheratsuchheightsas18000or20000meters.

  Aeroplanescannotclimbashighorasquicklyincoldairasinwarm.Norcanclouds.Inpracticethisisanadvantagetotheaeroplanewhichisalreadyatagoodheightwhenitreachesthepolarregionandsodoesnotneedtoclimbwhileatthesametimecoldairkeepsthecloudsdown.

  1.ScientistscanliveintheNorthPolebecause______.

  A.theyknowtheplacewell

  B.theyarespeciallytrained

  C.theyarenotordinarypeople

  D.theyarewellequipped

  2.Fromthepassageweknowthatthepolarregionis______.

  A.agoodplacetoreachbysea

  B.anattractingplacecoveredbyvariouskindsofplants

  C.agoodplacetoflyover

  D.agoodplacetogoonholiday

   

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2020-06-13 19:12
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贺振东

  答案:1D2C解析:1、Atthepresenttimeonlythescientistsandexplorerscandosoandtheyusespecialequipment.根据这句可知答案。2、由文章最后一段可知答案应为C。 ...

2020-06-13 19:14:42

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