职称英语卫生类B级阅读理解练习.docx

职称英语卫生类B级阅读理解练习职称英语卫生类B级阅读理解练习2017年的`职称英语考试预计在3月份，下面是小编整理的卫生类b级阅读理解练习，希望能帮到大家!HighStressMayDamageMemoryAccordingtoareportissuedinMay1998,elderlypeoplewhoconsistentlyhighbloodlevelsofthestresshormone.What'smore,highlevelsofcortisolarealsoassociatedwithshrinkingofthehippocampus(海马区),aregionofthebrainthatplaysakeyroleinlearningandmemory.Thefindingssuggestthatevencortisollevelsinthenormal,"healthy"rangecanactuallyacceleratebrainaging.Thestudyresults"nowprovidesubstantialevidencethatlong-termexposuretoadrenal(肾上腺)stresshormonesmaypromotehippocampalaginginnormalelderlyhumans,"writeNadaporterandPhillipLandfield.Cortisolisahormonereleasesinresponsetostressbytheadrenalglands(腺),whichsitontopofthekidneys(肾).Overa5-to6-yearperiod,dr.Sonialupineandhiscolleaguesmeasures24-hourcortisollevelsin51healthyvolunteers,mostwhomwereintheir70s.Theresearcherstestedthevolunteers'memoryonsixpeopleintheincreasing/highcategoryandfivepeopleinthedecreasing/moderategroup.Thegroupsdidnotdifferintestsofimmediatememory,buttheincreasing/highcortisolgrouphadothermemoryproblemscomparedwiththoseinthedecreasing/moderategroup.Theresearchersalsofoundthatthetotalvolumeofthehippocampusinthoseintheincreasing/highgroupwas14%lowerthanthoseinthedecreasing/moderategroup,althoughtherewerenodifferencesinotherbrainregions.Theresultssuggestthat"…brainagingcanbeacceleratedbylevelsofadrenalhormonesthatarenotgenerallyregardedaspathological(病态的)andthatvariationwithinthisnormalrangeisrelatedtovariationintherateofbrainaging."writeporterandlandfield."Thisfurthersuggeststhatchronicstressmayacceleratetheworseningofthehippocampus.6whichofthefollowingplaysakeyroleinone'slearningandmemory?AthekidneysBtheadrenalhormoneCthestresshormoneDthehippocampus7whenthelevelsofcortisolgohigh,thehippocampusAmayexpandBmayshrinkCmaydisappearDmayfunctionbetter8accordingtothepassage,whenpeopleareunderstress,AtheadrenalglandswillproducecortisolBthekidneyswillshrinkrapidlyCthehippocampuswillprod