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1、大学英语四级考试ModelTestThreePartⅠWritingDirections:Forthispart,youareallowed30minutestowritealetter.Youshouldwriteatleast120wordsfollowingtheoutlinegivenbelowinChinese:给你的外国朋友写一封信，告诉他(她)你已经被美国的一所大学录取，但你苦恼的是自己的听力和口语水平不够，你想寻求他(她)对于如何提高听和和口语的建议。PartⅡReadingComprehension(Skimmi
2、ngandScanning)Directions:Inthispart,youwillhave15minutestogooverthepassagequicklyandanswerthequestionsonAnswerSheet1.Forquestions1-7,choosethebestanswerfromthefourchoicesmarked[A],[B],[C]and[D].Forquestions8-10,completetilesentenceswiththeinformationgiveninthepassage.
3、TheEarthPowerandLightComparedtotherestoftheuniverse,theEarthisverysmall.Ourplanetandeight(ormaybenine)othersorbittheSun,whichisonlyoneofabout200billionstarsinourgalaxy.Ourgalaxy,theMilkyWay,ispartoftheuniverse,whichincludesmillionsofothergalaxiesandtheirstarsandplanet
4、s.Bycomparison,theEarthismicroscopic.Comparedtoaperson,ontheotherhand,theEarthisenormous.Ithasadiameterof7,926miles(12,756kilometers)attheequator,andithasamassofabout6×1024kilograms.TheEarthorbitstheSunataspeedofabout66,638milesperhour(29.79kilometerspersecond).Don'td
5、wellonthosenumberstoolong,though;toalotofpeople,theEarthisinconceivably,mind-bogglinglybig.Andit'sjustafractionofthesizeoftheSun.FromourperspectiveonEarth,theSunlooksverysmall.Thisisbecauseit'sabout93millionmilesawayfromus.TheSun'sdiameteratitsequatorisabout100timesbi
6、ggerthanEarth's,andaboutamillionEarthscouldfitinsidetheSun.TheSunisinconceivably,mind-bogglinglybigger.ButwithouttheSun,theEarthcouldnotexist,inasense,theEarthisagiantmachine,fullofmovingpartsandcomplexsystems.Allthosesystemsneedpower,andthatpowercomesfromtheSun.TheSu
7、nisanenormousnuclearpowersource-throughcomplexreactions,ittransformshydrogenintohelium,releasinglightandheat.Becauseofthesereactions,everysquaremeterofourplanet'ssurfacegetsabout342WattsofenergyfromtheSuneveryyear.Thisisabout1.7×1017Wattstotal,orasmuchas1.7billionlarg
8、epowerplantscouldgenerate.YoucanlearnabouthowtheSuncreatesenergyinHowtheSunWorks.WhenthisenergyreachestheEarth,itprovidespow
