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1、高考英语一轮复习阅读理解拉分题特训（一） OnaSaturdaymorningearlierthisSeptember,theworldgotitsfirstlookattheStrati.Thiselectricvehicleisunlikeanyothercurrentlyontheroad.Itrollsonfourwheels,butitsbodyandchassis(底盘)weren'tbuiltinafactory.Instead,Strati'sdesignersusedatechn
2、ologycalled3-Dprinting.Itcreatedthosepartsofthecarinonepiece,fromthegroundup. “Comparedtoatypicalvehicleontheroad,theStratidefinitelylooksdifferent,”saysGregSchroeder,aseniorresearchengineerattheCenterforAutomotiveResearchinAnnArbor,Mich.Hedidnotworko
3、nthenewcar.Hisorganizationstudiestrendsandchangesintheautoindustry. Ittook44hourstoprintthenewcarattheInternationalManufacturingTechnologyShowinChicago.Overthenextfewdays,thecar'sdesignersinstalledadditionalparts.Theseincludedthecar'sengine,brakesandt
4、ires.Then,earlyonSeptember13,JayRogersclimbedintothecar,starteditsengineanddrovethevehicleontothestreet.RogershelpedfoundLocalMotors.It'stheArizona-basedcompanybehindtheStrati.Twoweekslater,histeamprintedasecondStrati,andjustasfast,atafairinNewYorkCity.
5、 JustinFishkin,alocalMotorsofficial,seestheStratiasawindowintothefuture.Today,carbuyersarelimitedintheirchoiceofavehicle.Theycanorderonlywhatcarcompanieshavealreadydesigned.Butinthefuture,hesays,youmaybeabletodesignyourowncaronlineandthengetitprintedt
6、oorder. Manufacturingexpertssay3-Dprintinghasbeguntorevolutionizehowtheymakethings.Thetechnologyhasbeenaroundfordecades.Butthesemachinesusedtobesoexpensivethatonlylargecompaniescouldaffordthem.Inthelastfewyears,though,thathaschanged.Manyofthemachinesa
7、renowinexpensiveenoughforsmallcompanies—orevenindividuals—toown.Somelocallibrariesmakethemavailabletothepublic.HighSchoolsarebeginningtousetheminclassrooms.Wideaccesstotheseprintersmeanspeoplecannowdesignandprintawidevarietyofnewthings. Thecar'sprinte
8、risaone-of-a-kinddevice. Thetechnologybehindthe3-DprinterusedinChicagoisanexampleofadditivemanufacturing.Thisprocessbuildssolidobjects,slicebyslice,fromthebottomup.(“Strati”meanslayers,inItalian.)Amechanicalarmmovesanozzlefromo
