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英语阅读（十五）AWhenmyfirstwartimeChristmascame,IwasinbasictraininginNewJerseyandnotsureifIwouldmakeithomefortheholidays.OnlyontheafternoonofDecember23wasthelistofmenwhowouldhavethree-daypassesposted.Iwasoneoftheluckysoldiers.ItwasChristmasEvewhenIarrivedhome,andalittlesnowhadfallen.Motheropenedthefrontdoor.Icouldseebeyondher,intothecornerofthelivingroomwherethetreehadalwaysstood.Therewerelights,allcolors,andornamentsshiningagainstthegreenofapine.“Wherediditcomefrom?”Iasked.“IaskedGatesboytocutit,”mymothersaid.“Iwouldn’thavehadonejustformyself,butwhencalled-on,sucharush!Hejustbroughtitinthisafternoon…”.Thepinereachedtotheproperheight,almosttotheceiling,andtheTreeTopCrystalStarwasitsplace.Afewgreenbranchesreachedaboutalittleawkwardly(难看)attheside,Ithought,andtherewasabitofbaretrunkshowinginthemiddle.ButthetreefilledtheroomwithwarmlightandthewholehousewiththepleasantsmellofChristmas.“It’snotliketheoneyouusedtofind,”mymotherwenton.“Yourswerealwaysingoodshape.IsupposetheGatesboydidn’tknowwheretolook.ButIcouldn’tbefussy(挑剔).”“Don’tworry,”Itoldher.“It’sperfect.”Itwasn’t,ofcourse,butatthemomentIrealizedsomethingforthefirsttime:allChristmastreesareperfect.1．Fromthepassagewecaninferthat.A．thewriterspenthisfirstChristmasduringthewarB．soldiersdidnotallgohomeforChristmasduringthewarC．allthesoldiershadthree-daypassesD．thewritercouldnotgohomeforChristmas2．Fromthepassage,wecanconcludethat.A．thewriterusedtocutverybeautifulChristmastreesB．hismotherdidn’tlikeChristmastreesC．hismotherdidn’twanttohaveaChristmastreebecauseitwaswartimeD．thewriterdidn’tlikethetreecutbysomeoneelse3．Thebesttitleforthispassagewouldbe.A．HowtoChooseaChristmasTreeB．HowSoldiersSpentTheirChristmasC．ThePerfectChristmasTreeD．TheChristmaswithanUglyChristmasTreeBScientistsfoundthatourEarthisnotcold,hardrockallthewaythrough.Notatall.Onlythecrust,theoutsideoftheearthiscold,solidrock.BelowthiscoldsolidcrustoftheEarth,thereishotrockthatmeltsinplaces.Everynowandthensomeofthehot,meltedrockispushedout.Thishot,meltedrockexpands,andcanpushitswayoutthroughaweakspotintheEarth’scrust.Whenthishappens,avolcanoismade.ThemeltedrockbelowtheEarth’scrustcanflow,liketoothpaste(牙膏),ifitissqueezed.Ifyousqueezeapartlyfilledtubeoftoothpasteinoneplace,whathappens?Thetoothpasteflowstoanotherpartofthetube.Ifyoupressdownononepartofthetubewithafinger,whathappens?Thistuberisesinanotherplace,asthetoothpasteflowsthere,makingahill.Strangelyenough,whenavolcanoforms,theEarthmaybebehavinglikeatubeoftoothpaste.IftheEarthispresseddowninoneplace,itmayriseinanotherplace.Hot,meltedrockwithintheEarthmayflowtoanotherplaceastheEarthispresseddown.Whenthishot,meltedrockbreaksthroughtheEarth’scrust,avolcanoforms.Avolcanoisonlyonekindofmountain.OtherkindsofmountainsformwhentheEarth’scrustisraised.ButeachtimetheEarthisraisedinoneplace,somethingispressingagainsttheEarthinanotherplace.4．Scientificfindingshaveprovedthat.A．theearthiscoldwithhardrockbeingeverywhereB．theearthishotC．theearthisneitherhotnorcoldD．theoutsideoftheearthiscoldwhilethereishotrockbelowthiscoldhardrock5．Whatisavolcano?A．Itisatubeoftoothpaste.B．Itisakindofmountain.C．Whenthecoldhardrockbecomeshotandmelts,itisavolcano.D．Whenthecoldhardrockbecomeshardandmelts,itispushedout.Thusavolcanoisformed.6．Whichofthefollowingistrue?A．Ifthereishotandmeltedrock,therewillbeavolcano.B．Amountainisformedwhenthehotandmeltedrockpushesout.C．Avolcanoislikeatubeoftoothpaste.D．AmountainisformedwhenthemeltedrockbelowtheEarth’scrustflows.CLastweek,Iboughtanalarmsystemforabout$450.Itconsistedofacontrolunitwiththreesmallunits.Iputthecontrolunitinthesitting-roomandfastenedtheotherunitsbythefrontdoor,backdoorandliving-roomwindows.Theinstructionstoldustochoosethreenumbers,sowechose491,thelastthreenumbersofourtelephonenumber.NowImustexplainhowthealarmworks:1.Thereisapowersireninthecontrolunit.Itmakesaveryloudnoise.2.Eachofthesmallunitssendsoutbeamsorraysindifferentdirections.Ifanythingmoves,itbreaksabeam.Thissendsasignaltothecontrolunit.Thesirenmakesanoisewhichyoucanhear50metersaway.3.Whenwegotobed,Ipressthethreebuttonsnumbered4,9and1.Thenwehave30secondstogetoutoftheroombeforethealarmstartstowork.ThatmightIsleptsoundlybecauseIwassurethatnoburglarcouldgetintoourhouse.However,atabout2:10a.m.,Iwokeupandheardthesiren.“Theremustbeaburglarinthehouse,”Marysaid.“Whatshallwedo?”“I’llgoandseewho’sthere,”Isaid.“Stayhere.Don’tmakeanoise.”Iwentdownstairsquietly.WhenIreachedtheliving-room,Iswitchedonmytorchandlookedroundtheroom.ThenIturnedthelighton.Iswitchedthesirenoffandsearchedtheroomsdownstairs.Therewasnothingwrongexceptthatthebackdoorwasunlocked.Ilockedit,re-setthealarmandwentbacktobed.Aboutanhourlater,thealarmstartedagain.Ijumpedoutofbed,felloverachairinthedarkandbumpedintothebedroomdoor.Marywokeupandstartedhittingmewithatorch.“Hey!Waitaminute!”Iwhispered.“It’sonlyme.I’mgoingdownstairstoseewhat’swrong.”Iwentdownintotheliving-roomandlistenedforamoment.TheonlysoundIcouldhearwasthesiren.Iturnedonthelightandthenswitchedthesirenoff.AsIdidso,Iglancedacrossatthecurtainsinfrontofthewindows.Isawa