期中备考真题演练-初三-2

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1、阅读理解(101中学初三月考)CIntheverybeginningofearth'shistory,thisplanetwasagiant,redhot,boilingseaofmeltedrock・Theheathadbeenproducedbytherepeatedhighspeedcollisions(碰撞)ofmuchsmallerbodiesofspacerocks.Asthecollisionsreduced,theearthbegancoolformingahardthinsurface.Asthecoolingcontinued,cloudsf

2、ormedandmoreandmorewaterpoureddownontheearth,coolingthesurfacefurtheruntiliswasfloodedwithwaterformingthesea.Peopleacceptthetheorythatthetrueageoftheearthisabout4.6billionyearsold,formedataboutthesametimeastherestofoursolarsystem.Theoldestrocksthatscientistshavebeenabletofindare3.9bi

3、llionyearsold・Usingradiometric-datingmethodstodeterminetheageofrocksmeansscientistshavetorelyonwhentherockwasfirstformed・Intheearlyageofourhomeplanettheentireearthwasameltedrock・Sincewecanonlymeasureasfarbackintimeaswehadsolidrockonthisplanet,wearelimitedinhowwecanonlymeasurethereala

4、geoftheearth.Alsoourplanetisachangingone:newmountainsforming,oldoneswearingdown,volcanoesmeltingandre-shapingnewcrust.Thecontinualchangingandreshapingoftheearth'ssurfacehasmuchremovedmostofthefirstrocksthatcamewithearthwhenitwasnewlyformed.Sotheageisatheoreticalone・()35.Whichofthefol

5、lowingcouldbethebesttitleforthepassage?A.Howoldistheearth?B.Whenwasthesolarsystemformed?C.Whatisradiometricdatingmethod?D・Whywastheearthatfirstanoceanofmeltedrock?()36.Thedifficultyinmeasuretheageoftheearthliesinthefollowingfactsexceptat.A.scientistscanonlymeasureasfarbackintimeasweh

6、adsolidrockontheplanetB・ourearthhaschangedalotC.mostofthefirstrockswereremovedD.Scientistsdon'thaveanyequipmentformeasuringtheageoftheearth()37.Accordingtothetext,wecanlearnthat.A.scientistscantdeterminetheageoffirstrocksB•theageoftheearthisonlybasedontheoryC.wecanmeasuretherealageof

7、theearthifthereisnooceanontheearthD.theageoftheearthisexactlyright完形填空(北京四中初三月考)EversinceJonathanhadsetupthehouseinComptonStreet,hehadlookedafteritverycarefully.Beforeheleftthehouseinthemorning,hecarefullyclosedallthe_3&downstairs,openedsomewindowstolettheairinandlockedthefrontgate39

8、Jonathandidw