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1、大学英语四级考试模拟题一PartIWriting(30minutes)PartⅡReadingComprehension(SkimmingandScanning)(15minutes)Directions:Inthispart,youwillhave15minutestogooverthepassagequicklyandanswerthequestionsonAnswerSheet1.Forquestions1-7,choosethebestanswerfromthefourchoicesmarkedA),B),C),andD).Forquestions8-10,c
2、ompletethesentenceswiththeinformationgiveninthepassage.WhatIsaSolarEclipse?Solareclipsesarecausedwhenthemoongetsinfrontofthesunasviewedfromthesurfaceoftheearth.Themooncanonlygetinfrontofthesunduringanewmoonphase,whichoccursaboutonceamonthwhenthemoonisnotvisibleatallduringthenight.Thewor
3、declipsemeanstoblockone’sviewofsomething.Lookatalightbulborawindow.Nowputyourhandinfrontofyourfacesoyoucannotseethelightorwindow.Youcannowsaythatyourhandhadeclipsedthelightbulborwindow.Whenmostthingsgetblockedfromourview,wedonotusethetermeclipsetodescribetheevent.Instead“eclipse”isreser
4、vedforspecialsituationslikewhenthesunisblockedbythemoon.ThetermSolarEclipseisusedtodescribethisspecialsituation.Ifdarkcloudsobscurethesun,thisisnotaneclipse.Havingcloudscoverthesunwillhappenmanytimesayear(insomelocations,itisthenormalweatherpattern)andisnotthatunusual.Butthemooncovering
5、thesunisunusual.Asolareclipsedoesnotoccurduringeverynewmoonphasebecausetheorbitofthemoonaroundtheearthistiltedinrespecttotheapparentorbitofthesun.Whydosolareclipsesoccuronlyduringthenewmoon?Forasolareclipsetooccur,themoonmustbeinthenewmoonphaseanddirectlybetweentheearthandthesun.Weseean
6、ewmoon,becausethemoonisbetweenthesunandtheearth,sothesideofthemoonlitbythesunisawayfromtheearth,andonlyasliverofthemoonislitfromtheearth’sperspective.Youmaywonder,“Whydowenothaveasolareclipseeverynewmoon?”AlthoughitistruethatboththesunandmoonappearinthesamegeneralareaoftheskyalongtheEcl
7、iptic(sunorbit),themoonorbitistippedslightly.ThusthemoonmaybefoundanywherealonganarrowribbonwrappedaroundtheEcliptic.Becausethesun,moon,andplanetsallcanbefoundalongtheEcliptic,theconstellationsintheskyalongthispathwereconsideredtobeofspecialsignificancebymanyancientcultures.The
