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1、2013年英语四级考试真题与答案（除听力） PartIIReadingComprehension(35minutes) Directions:Thereare4passagesinthispart.Eachpassageisfollowedbysomequestionsorunfinishedstatements.ForeachofthemtherearefourchoicesmarkedA),B),C)andD).Youshoulddecideonthebestchoiceandmarkthecorrespondingletteronth
2、eAnswerSheetwithasinglelinethroughthecenter. PassageOne Questions21to25arebasedonthefollowingpassage. Designofallthenewtoolsandimplementsisbasedoncarefulexperimentswithelectronicinstruments.First,ahuman“guineapig”istestedusingaregulartool.Measurementsaretakenoftheamountof
3、workdone,andthebuildupofheatinthebody.Twistedjointsandstretchedmusclescannotperformaswell,ithasbeenfound,asjointsandmusclesintheirnormalpositions.Thesamepersonisthentestedagain,usingatooldesignedaccordingtothesuggestionsmadebyDr.Tichauer.Allthesetestshaveshownthegreatimprove
4、mentofthenewdesignsovertheold. OneoftheelectronicinstrumentsusedbyDr.Tichauer,themyograph（肌动记器）,makesvisiblethroughelectricalsignalstheworkdonebyhumanmuscle. Anothermachinemeasuresanydangerousfeaturesoftools,thusprovinginformationuponwhichtobaseanewdesign.Oneconclusionofte
5、stsmadewiththismachineisthatatripodstepladderismorestableandsafertousethanonewithfourlegs. Thisworkhasattractedtheattentionofefficiencyexpertsandtime-and-motion-studyengineer,butitsvaluegoesfarbeyondthat.Dr.Tichauer’sfirstthoughtisforthehealthofthetooluser.Withtherepeatedus
6、eofthesametoolalldaylongonproductionlinesandinotherjobs,evenlightmanualworkcanputaheavystressononesmallareaofthebody.Intime,suchstresscancauseadisablingdisease.Furthermore,musclefatigueisaserioussafetyhazard. Efficiencyistheby-productofcomfort,Dr.Tichauerbelieves,andhisnewd
7、esignsfortraditionaltoolshaveprovedhispoint. 21.Whatareinvolvedinthedesignofanewtoolaccordingtothepassage? A)Electronicinstrumentsandaregulartool. B)Ahuman“guineapig”andaregulartool. C)Electronicinstrumentsandahuman“guineapig”. D)Electronicinstruments,ahuman“guineapig”a
8、ndaregulartool. 22.Fromthepassageweknowthatjointsandmusclesperformbestwhen
