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1、最权威的国际教育服务平台GMAT句子作用（Boldface）题例解 1.Modernnavigationsystems,whicharefoundinmostoftoday'scommercialaircraft,aremadewithlow-powercircuitry,whichismoresusceptibletointerferencethanthevacuum-tubecircuitryfoundinolderplanes.(Duringlanding,navigationsystemsreceiveradio
2、signalsfromtheairporttoguidetheplanetotherunway).Recently,oneplanewithlow-powercircuitryveeredoffcourseduringlanding,itsdialsdimming,whenapassengerturnedonalaptopcomputer.(Clearly,modernaircraftnavigationsystemsarebeingputatriskbytheelectronicdevicesthatpassengers
3、carryonboard,suchascassetteplayersandlaptopcomputers.) Thetwoportionsinboldfaceplaywhichofthefollowingroles? (A)Thefirstisaprinciplethattheargumentreliesonandthesecondisaconclusionthatcanbedrawnfromthefirst. (B)Thefirstisafactthatargumentreliesonandthesecondisa
4、conclusionthatmustbedrawnfromthisargument. (C)Thefirstacknowledgesaconsiderationthatsupportsthatmainposition;thesecondisthatconclusion. (D)Thefirstisanevidencethatsupportstheconclusion,thesecondisthatconclusion. (E)Thefirstisaprinciplethatisnecessaryforthisargu
5、ment,thesecondisaconclusionthatcouldbedrawnfromthisargument. 参考答案：E 思路：Modernnavigationsystems,whicharefoundinmostoftoday'scommercialaircraft,aremadewithlow-powercircuitry,whichismoresusceptibletointerferencethanthevacuum-tubecircuitryfoundinolderplanes.（Fact）（D
6、uringlanding,navigationsystemsreceiveradiosignalsfromtheairporttoguidetheplanetotherunway).（Principle）Recently,oneplanewithlow-powercircuitryveeredoffcourseduringlanding,itsdialsdimming,whenapassengerturnedonalaptopcomputer.(evidence)(Clearly,modernaircraftnavigat
7、ionsystemsarebeingputatriskbytheelectronicdevicesthatpassengerscarryonboard,suchascassetteplayersandlaptopcomputers.)(conclusion)资料来源：教育优选http://www.jybest.cn/最权威的国际教育服务平台 本题争论主要在(B)和(E)。第一部分是factorprinciple? 根据(fromCambridgeDictionaryofAmericanEnglish) princip
8、le(BASICTRUTH) noun[Coftenpl] abasictruththatexplainsorcontrolshowsomethinghappensorworks theprinciplesofNewtonianphysics Duringlanding,navigationsy
