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第PAGE\*MERGEFORMAT6页共NUMPAGES\*MERGEFORMAT6页 英语四级听力新题型模拟2021(第10套)短文(3) |6Qb_MHEW#FwMaHI.|xSYpF~y)Questions23to25arebasedonthepassageyouhavejustheard.=]=5zc8PK_E1TI23A.Exposingskintosunlightwillcertainlyleadtoskincancer.B.UVrayscanhelplowerpeople'sbloodpressure.C.Heartattacksandstokearelinkedtolowbloodpressure.D.Bathinginthesunhelpsbuildpeople'smentalhealth.H7_h!Ncj%0-bN24A.VitaminDB.UVrays.C.Bodytemperature.D.Bloodpressure.cv!aW,~7qbrm_iA25A.Heartrate.B.VitaminDlevels.C.Bodytemperature.D.Bloodpressure.Q%WC7ld1K)V!W%xJ_;H|*DKiomW_f;uMse^&sGuVF1Xk9rLZ7q_Gd@__doTj=#kC^41GMwR0+Unl&)4K+TTeVPassageThreePpJYRyII,mm.(8Z(HijThehealthbenefitsofexposingskintosunlightmayfaroutweightheriskofdevelopingskincancer,accordingtoscientists.EdinburghUniversityresearchsuggestssunlighthelpsreducebloodpressure,cuttingheartattackandstrokerisksandevenprolonginglife.UVrayswerefoundtoreleaseacompoundwhichlowersbloodpressure.Researcherssaidmorestudieswouldbecarriedouttodetermineifitistimetoreconsideradviceonskinexposure.Heartdiseaseandstrokelinkedtohighbloodpressureareestimatedtoleadtoabout80-timesmoredeathsthanthosefromskincancerintheUK.Productionofthepressurereducingcompoundisseparatefromthebody'smanufactureofvitaminD,whichrisesafterexposuretosunshine.ResearcherssaidthatuntilnowvitaminDhadbeenthoughttosolelyexplainthesun'sbenefittohumanhealth.mJDz&]rxWY]0MJFPDuringtheresearch,researchersstudiedthebloodpressureof24volunteersunderUVandheatlamps.Inonesession,thevolunteerswereexposedtoboththeUVraysandtheheatofthelamps.Intheother,theUVrayswereblockedsothatonlytheheatofthelampsaffectedtheskin.TheresultsshowedthatbloodpressuredroppedsignificantlyforonehourfollowingexposuretoUVrays,butnotaftertheheat-onlysessions.Scientistssaidthatthissuggesteditwasthesun'sUVraysthatleadtohealthbenefits.Thevolunteers'vitaminDlevelsremainedunaffectedinbothsessions.ThestudywillbepresentedinEdinburghattheworld'slargestgatheringofskinexperts.,E!1fa,IKO(0pOs23.WhatcanbelearnedfromEdinburghUniversity'sresearch?2
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