小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com专题22科普类说明文阅读理解(2010﹒安徽﹒阅读理解B)Haveyoueverwondered?1.Whydoairplanestakelongertoflywestthaneast?Itcantakefivehourstogowest-eastfromNewYork(NY)toLondonbursevenhourstotraveleast-westfromLondontoNY.Thereasonforthedifferenceisanatmosphericphenomenonknownasthejet(喷射)stream.ThejetstreamisaveryhighaltitudewindwhichalwaysblowsfromthewesttotheeastacrosstheAtlantic.Theplanesmovingataconstantairspeedthusgofasterinthewest-eastdirectionwhentheyaremovingwiththewindthanintheoppositedirection.2.WhatwouldhappenifthegravityonEarthwassuddenlyturnedoff?Supposingwecouldmagicallyturnoffgravity.Wouldbuildingsandotherstructures(建筑物)floataway?WhathappenedwoulddependonhowstronglythethingswereattachedtotheEarth.TheEarthismovingatquiteaspeed,movingatoverathousandmilesperhours.Ifyouturnsomethingaroundyourheadonastring（细绳）,itgoesaroundinacircleuntilyouletgoofthestring.Thenitfliesoffinastraightline.‘Switchingoff’gravitywouldbelikelettinggoofthestring.ThingsnotattachedtotheEarthwouldflyoffinastraightline.Peopleinbuildingswouldsuddenlyshootupwardsatagreatspeeduntiltheyhittheceiling.Mostthingsoutsidewouldflyoffintospace.60.Whatinformationcanwegetfromthefirstpassage?A.ItisjetstreamthataffectshowfastairplanesflyB.PlanesgoslowerwhentheyaremovingwiththewindC.IttakesmoretimetoflyfromNYtoLondonthanfromLondontoNYD.TheyetstreamalwaysblowsfromtheeasttothewestacrosstheAtlantic61.Theword”shoot”underlineinthe2ndpassageprobablymeans“”A.sendforB.movequicklyC.comeoutD.grrowquickly小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com62.Itcanbeinferredthatwithoutgravity.A.buildingsandotherstructureswouldfloatawayB.treesandbuildingswouldnoteasilyflyoffC.somethingaroundyourheadwouldnotflyawayD.everythingoutsidebuildingswouldflyoffintospace63.WherecanwemostprobablyreadinthetextA.InareseachpaperB.InashortstoryC.InatravelmagazineD.Inastudent’sbook(2010﹒江苏﹒阅读理解D)Imagine，oneday，gettingoutofbedinBeijingandbeingatyourofficeinShanghaiinonlyacoupleofhours，andthen，afterafulldayofwork，goingbackhometoBeijingandhavingdinnerthere．Soundsunusual，doesn'tit?Butit'snotthatunrealistic，withthedevelopmentofChina’shigh—speedrailwaysystem．Andthat’snota11．Chinahasanevengreaterhigh—speedrailwayplan—toconnectthecountrywithSoutheastAsia，andeventuallyEasternEurope．Chinaisnegotiatingtoextenditsownhigh·-speedrailwaynetworktoupto17countriesin10to15years，eventuallyreachingLondonandSingapore．Chinahasproposedthreesuchprojects．ThefirstwouldpossiblyconnectKunmingwithSingaporeviaVietnamandMalaysia．AnothercouldstartinUrumqiandgothroughKazakhstanandUzbekistan，andpossiblytoGermany．ThethirdwouldstartinthenortheastandgonorththroughRussiaandthenintoWesternEurope．IfChina’splanforthehigh-speedrailwaygoesforward，peoplecouldzipoverfromLondontoBeilinginundertwodays．ThenewsystemwouldstillfollowChina’shigh—speedrailwaystandard．Andthetrainswouldbeabletogo346kilometersanhour，almostasfastassomeairplanes．China’sbullettrain(高速客车)，theoneconnectingWuhantoGuangzhou，alreadyhastheWorld’sfastestaveragespeed．Itcovers1,069kilometersinaboutthreehours．小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com小学、初中、高中各种试卷真...