Passage1 AconceptcardevelopedbyJapanesecompanyNissanhasabreathalyzer-likedetectionsystemandotherinstrumentsthatcouldhelpkeepdrunkorovertireddriversofftheroad. Thecar'ssensorscheckodorsinsidethecarandmonitoradriver'ssweatfortracesofalcohol.Anin-carcomputersystemcanissueanalertorevenlockuptheignitionsystemifthedriverseemsover-the-limit.Theairodorsensorsarefixed'firmlyanddeeplyinthedriverandpassengerseats,whileadetectorinthegear-shiftknobmeasuresperspirationfromthedriver'spalm. Othercarmakershavedevelopedsimilardetectionsystems.Forexample,Sweden'sVolvohasdevelopedabreathalyzerattachedtoacar'sseatbeltthatdriversmustblowintobeforetheenginewillstart. Nissan'snewconceptvehiclealsoincludesadashboard-mountedcamerathattracksadriver'salertnessbymonitoringtheireyes.ItwillsoundanalarmandissueaspokenwarninginJapaneseorEnglishifitjudgesthatthedriverneedstopulloverandrest. Thecartechnologyisstillindevelopment,butgeneralmanagerKazuhiroDoisaysthecombinationofdifferentdetectionsystemsshouldimprovetheoveralleffectivenessofthetechnology."Forexample,ifthegear-shiftsensorwasbypassedbyapassengerusingitinsteadofthedriver,thefacialrecognitionsystemwouldstillbeused,"Doisays.Nissanhasnospecifictimetableformarketingthesystem,butaimstousetechnologytocutthenumberoffatalitiesinvolvingitsvehiclestohalf1995levelsby2015. Thecar'sseatbeltcanalsotightenifdrowsinessisdetected,whileanexternalcamerachecksthatthecariskeepingtoitslaneproperly.However,Doiadmitsthatsomeofthetechnology,suchasthealcoholodorsensor,shouldbeimproved."Ifyoudrinkonebeer,it'sgoingtoregister,soweneedtostudywhat'stheappropriatelevelforthesystemtoactivate,"hesays. IntheUK,someresearchgroupsareusingsimilaradvancedtechniquestounderstanddriverbehaviorandtheeffectivenessofdifferentroaddesigns. WhathasVolvodeveloped?
A.The same detection system mentioned in the previous paragraph.
B.A breathalyzer attached to a car's seat belt.
C.A smart car seat belt.
D.An intelligent engine.
正确答案是B