题目内容：
SingingAlarmsCouldSavetheBlindIfyoucannotsee,youmaynotbeabletofindyourwayoutofaburningbuilding–andthatcouldbefatal.AcompanyinLeedscould____________（51）allthatwithdirectional（定向的）soundalarmscapableofguidingyoutotheexit.
SoundAlert,acompanyrun__________（52）theUniversityofLeeds,isinstallingthealarmsinaresidentialhomefor______________（53）peopleinSommersetandaresourcecenterfortheblindinCambria.Thealarmsproducea_____（54）rangeoffrequenciesthatenablethebrainto________（55）wherethesoundiscomingfrom.
DeborahWithingtonofSoundAlertsaysthatthealarmsusemostofthefrequenciesthatcanbe__________（56）byhumans.“Itisaburstofwhitenoisethatpeoplesaysoundslikestatic（静电噪音）ontheradio,”shesays.“Itslife-savingpotentialis______（57）.”
Sheconductedanexperimentinwhichpeoplewerefilmedbythermal-imaging（热效应成像）camerastryingtofindtheir_________（58）outofalargesmoke-filledroom.It________（59）themnearlyfourminutestofindthedoorwithoutasoundalarm,________（60）only15secondswithone.
Withingtonstudieshowthebrain______（61）soundsattheuniversity.Shesaysthatthe_________（62）ofawidebandoffrequenciescanbepinpointed（精确地确定）moreeasilythanthesourceofanarrowband.Alarms___________（63）onthesameconcepthavealreadybeeninstalledonemergencyvehicles.
Thealarmswillalsoincluderisingorfallingfrequenciesto_________（64）whetherpeopleshouldgoup
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