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已知a是的整数部分，b是的小数部分，求a（b-）的值
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8分Irisscan虹膜扫描pleasethebank'scomputervoicetellsyou.Youstepupandthecomputerreadsyoureyecomparingittothestoredfileithasofyouriris.Theimageshadbettermatch﹣otherwiseyouwon'tbeabletogetyourmoney. Irisscanningandothertechnologiessuchasfingerprintandvoicescanninghaveappearedinmanysciencefictionmoviesinthepast.Todaytheseadvancedtechnologiesarepartoftherealworld.Theyarecommonatworkthebanktheairportandyourlocalprison.Theirisscanfingerprintscanandvoicescanareallexamplesofbiometrics生物测定学afastdevelopingareaofautomaticpersonalidentificationtechnology.Basicallybiometricsusesvariouswaystoverifyapersonsidentitybasedontheindividual'suniquecharacteristicsincludingfingerprintsvoicesirisesbodyheatpatternsfacialimageshandprintssignaturesandsoon. Biometricsidentificationsystemshaveanumberofadvantagesoverpasswordsystems.Theprimaryadvantageisthatanindividualhastobephysicallypresentinordertobeidentified.Anotherimportantadvantageisthattherearenopasswordstorememberforgetloseorsteal. Thevoicescanisthesimplestandmostaffordableformofbiometrics.Itonlyrequiresacomputeramicrophoneandthecorrectsoftware.Thesoftwarerecordsasubject'svoiceandthencomparesittoastoredvoicesampleforidentificationpurposes. Foradditionalsafetyfingerprintandhandprintscanscanalsobeemployed.Fingerprintscanstaketheimageofafingerprintandcompareittoastoredfileofprints.Handprintscansidentifytheuniquefeaturesofahand. Irisscanscurrentlygivethehighestlevelofaccuracyamongalltheavailablebiometricssystems.Anothertechnologyfullfacialscansiscurrentlyinuseatbordercrossingsandairports.Facialscanningequipmentcanactuallytrackandidentifymovingfaceswithinacrowd. Thepotentialofbiometricsisexcitingandencouraging.Withcontinueddevelopmenttestingandapplicationcurrenttechnologieswillbecomeevenmoreeffectiveinthefuture.Soonthedaysofpasswordandcarkeyswillbegone.Justdon'tleavehomewithoutyourfingerprints! 29.Thefirstparagraphservesasan. A.conclusionB.explanationC.commentD.example 30.TheunderlinedwordverifyinParagraph2probablymeans. A.changeB.confirmC.developD.protect 31.Whichisthemostaccurateformofbiometrics? A.TheirisscanB.ThefingerprintscanC.ThevoicescanD.Thefacialscan 32.Whatistheauthor'sattitudetowardsthefutureofbiometrics? A.Heisuncertainaboutit. B.Hefeelsdoubtfulaboutit. C.Hefeelshopefulaboutit. D.Heisworriedaboutit.
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