Duringthe19thcenturyscientistsfoundthatwhencertainpartsofthebrainofapersonwerehurthewouldlosethepowerofdoingcertainthings.Andsopeoplethoughtthateachpartofthebraindoesadifferentjob.Butmodernresearc
Duringthe19thcenturyscientistsfoundthatwhencertainpartsofthebrainofapersonwerehurthewouldlosethepowerofdoingcertainthings.Andsopeoplethoughtthateachpartofthebraindoesadifferentjob.Butmodernresearchhasdiscoveredthatthisisnotsoforitisnoteasytoshowexactlywhateachpartofthebraindoes.
Inthepastfiftyyearstherehasbeenagreatincreaseintheamountorresearchdoneonthebrain.Scientistshavefoundoutthatthewaythebrainworksisnotsosimpleaspeopleingeneralmaythink.Chemiststellusthatabout100000chemicalchangestakeplaceinthebraineverysecond.Somerecentresearchesalsosuggestthatwecanremembereverythingthathappenedtous.Wemaynotbeabletothinkofthethingswehaveheardandseenbutitiskeptthereinthestore-houseofthehumanmind.Earlierscientiststhoughtthatthepowerofone’sbraingotweakerandweakerasonegrowsolder.Butitisplentyofexerciseitkeepsitspower.Itisnowthoughtthatisnottrue.Aslongasthebrainisgivenplentyofexerciseitkeepsitspower.Ithasprovedthatanoldpersonwhohasalwaysbeenactiveinthemindhasaquickermindthanayoungpersonwhohasdonephysicalworkwithoutusingmuchofhisbrain.
小题1:Inthelastcenturyscientistsfoundthatapersonwouldlosethepowertodocertainthings_____.A.whenhegotweakerinhealthB.ifcertainpartsofhisbrainwerehurtC.afterhedidaquitedifferentjobD.whenhegrewolder小题2:Scientiststodayarestillunabletoshowexactly______.A.whateachpartofthebrainisdoingB.howmanychemicalchangestakeplaceinthebraineachsecondC.whethereachpartofthebraindoesthesamejobD.whichpartofthebrainisthemostimportant小题3:Ithasbeenfoundthatone’sbrainusuallyworks______.A.fasterwhenheisoldB.alittlenowandalittlethenC.inaverysimplewayD.withoutanyrestalldaylong小题4:WhichofthefollowingisNOTtrueaccordingtothetext?A.Scientistsareworkinghardattheresearcheson