专业英语-专业英语四级分类模拟66

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1、专业英语四级分类模拟66READINGCOMPREHENSIONPassageAAblindbabyisdoublyhandicapped.Notonlyisitunabletosee,butbecauseitcannotreceivethevisualstimulusfromitsenvironmentthatasightedchilddoes,itislikelytobeslowinintellectualdevelopment•Nowtheten-montholdsonofDr•andMrs•DennisDaughtersi

2、sthesubjectofanunusualpsychologicalexperimentdesignedtopreventalaginthelearningprocess.Withtheaidofasonar-typeelectronicthathewearsonhishead,infantDennisislearningtoidentifythepeopleandobjectsintheworldaroundhimbymeansofechoes.ThedeviceisarefinementofthenSonicguide11,

3、aninstrumentproducedbyTelesensorySystems,Inc.,ofPaloAlto,Calif.,andusedbyblindadultsinadditiontoasaneorguidedog.AsadaptedforDennis,itconsistsofabattery-poweredsystemaboutthesizeofahalfdollarthatisonaheadgear.Atransmitteremitsanultrasonicpulsethatcreatesan80degreeconeo

4、fsoundat6feet.Echoesfromobjectswithintheconeareperceivedassoundsthatvaryinpitchandvolumewiththesizeanddistanceoftheobject.Thecloseranobjectis,thelowerthepitch,andthelargertheobject,thelouderthesignal•Hardsurfacesproduceasharpping,whilesoftonessendbacksignalswithasligh

5、tlyfuzzyquality.AnobjectslightlytothefightofDenny1ssendsbackaloudersoundtohisrightearthantotheleft.Thus,bysimplymovinghisheadrightandleftandupanddown,hecannotonlylocateanobjectbutalsogetsomenotionofitsshapeandsize,thankstothevaryingqualitiesofsoundsreachinghisearsasth

6、econeofultrasoundpassesitsedges

7、ealightgoingoninhishead.nWhatremainstobedeterminedishowwellthedevicewillhelpDenniscopewithhissurroundingsashebeginstowalkandventurefurtherintohisenvironment.Meanwhile,Telesensory,Inc.isworkingonthedevelopmentofsonardevicewithsomewhatthesamesensitivityasDennis1sforuseb

8、yschool-agechildren.1、Dr.andMrs.Daughters1researchisdirectedto.A.helpingtheblindtoseeandlearnaswellasothersB.facilitatingthe