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1、专题限时检测(二十一) 阅读理解C篇专练(二)(共3篇，限时24分钟)A(2019·南京、盐城二模)Listencarefullytothefootstepsinthefamilyhome,especiallyifithaswoodenfloors,andyoucanprobablyworkoutwhoitisthatiswalkingabout.Thefeaturesmostcommonlyusedtoidentifypeoplearefaces,voices,fingerprintsandretinalscans.Buttheir“behaviouralbiom
2、etrics”，suchasthewaytheywalk,arealsogiveaways.Researchershave,forseveralyears,usedvideocamerasandcomputerstoanalysepeople'sgaits,andarenowquitegoodatit.Buttranslatingsuchknowledgeintoapracticalidentificationsystemcanbetricky—especiallyifthatsystemissupposedtobehidden.Camerasareoftenvis
3、ible,arehardtosetup,requiregoodlightingandmayhavetheirviewblockedbyotherpeople.SoateamledbyKrikorOzanyanoftheUniversityofManchester,inEnglandandPatriciaScullyoftheNationalUniversityofIreland,inGalwayhavebeenlookingforabetterwaytorecognisegait.Theiranswer:pressuresensitivemats.Inthemsel
4、ves,suchmatsarenothingnew.Theyhavebeenpartofsecuritysystemsfordonkeys'years.ButDrOzanyanandDrScullyuseacomplexversionthatcanrecordtheamountofpressureappliedindifferentplacesassomeonewalksacrossit.Thesemeasurementsformapatternuniquetothewalker.DrOzanyanandDrScullythereforeturned,asisnow
5、commonforanythingtodowithpatternrecognition,toanArtificialIntelligencesystemthatusesmachinelearningtorecognisesuchpatterns.Itseemstowork.Inastudypublishedearlierthisyearthetworesearcherstestedtheirsystemonadatabaseoffootstepstroddenby127differentpeople.Theyfoundthatitserrorrateinidenti
6、fyingwhowaswhowasamere0.7%.AndDrScullysaysthatevenwithoutadatabaseoffootstepstoworkwiththesystemcandeterminesomeone'ssex—womenandmen,withwideandnarrowpelvises(骨盆)respectively,walkindifferentways—andguess,withreasonableaccuracy,asubject'sage.Amatbasedgaitrecognitionsystemhastheadvantage
7、thatitwouldworkinanylightingconditions—evenpitchdarkness.Andthoughitmightfailtoidentifysomeoneif,say,shewaswearingstilettosandhadbeenenteredintothedatabasewhilewearingtrainers,itwouldbeveryhardtofoolitbyimitatingthegaitofanindividualwhowasallowedadmissiontoaparticularplace.Thelatestp
