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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,navigationsystemsreceiveradiosignalsfromtheairp
2、orttoguidetheplanetotherunway).Recently,oneplanewithlow-powercircuitryveeredoffcourseduringlanding,itsdialsdimming,whenapassengerturnedonalaptopcomputer.(Clearly,modernaircraftnavigationsystemsarebeingputatriskbytheelectronicdevicesthatpassengerscarryonboard,suchascassetteplayersan
3、dlaptopcomputers.) Thetwoportionsinboldfaceplaywhichofthefollowingroles? (A)Thefirstisaprinciplethattheargumentreliesonandthesecondisaconclusionthatcanbedrawnfromthefirst. (B)Thefirstisafactthatargumentreliesonandthesecondisaconclusionthatmustbedrawnfromthisargument. (C)Thefirs
4、tacknowledgesaconsiderationthatsupportsthatmainposition;thesecondisthatconclusion. (D)Thefirstisanevidencethatsupportstheconclusion,thesecondisthatconclusion. (E)Thefirstisaprinciplethatisnecessaryforthisargument,thesecondisaconclusionthatcouldbedrawnfromthisargument. 参考答案：E 思路
5、：Modernnavigationsystems,whicharefoundinmostoftoday'scommercialaircraft,aremadewithlow-powercircuitry,whichismoresusceptibletointerferencethanthevacuum-tubecircuitryfoundinolderplanes.（Fact）（Duringlanding,navigationsystemsreceiveradiosignalsfromtheairporttoguidetheplanetotherunway)
6、.（Principle）Recently,oneplanewithlow-powercircuitryveeredoffcourseduringlanding,itsdialsdimming,whenapassengerturnedonalaptopcomputer.(evidence)(Clearly,modernaircraftnavigationsystemsarebeingputatriskbytheelectronicdevicesthatpassengerscarryonboard,suchascassetteplayersandlaptopco
7、mputers.)(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) principle(BASICTRUTH) noun[Coftenpl] abasictruththatexplainsorcontrolshowsomethinghappensorworks theprinciplesofNewtonianphysics
8、Duringlanding,navigationsy
