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1、Bodylanguage***阅读理解。VitaminBcouldhelplessentheeffectsofthemostdangeroustypeofairpollution,accordingtoanewstudypublishedrecently.Inthefirststudyofitskind,ateamofinternationalresearcherslookedatthedamagecausedbyoneofthepollutantsthathavethemostsevereimpactonhealth:PM2.5.Particulate
2、matter,orPM,isatypeofairpollutantconsistingofsmallparticlesofdifferentsizes.PM2.5hasadiameteroffewerthan2.5micrometers,about30timessmallerthanahumanhair.Theseparticlesaresosmallthattheycangointoourrespiratorysystem(呼吸系统),resultinginlungandsystemicinflammation(炎症)andstress.Theteam
3、foundthatsomethingassimpleasadailyvitaminBsupplementcouldpotentiallyreducetheimpactofthetinyparticlesonthehumanbody,althoughtheystressedthattheresearchwasinitsearlystagesandthesamplesizewassmall.Forthisstudy,10volunteerswereinitiallyexposedtocleanairandgivenaplacebo(安慰剂)tocheckth
4、eirresponses.ThegroupthentookanotherplaceboforfourweeksbeforebeingexposedtoheavilypollutedairfromdowntownToronto,whereanestimated1，000carspasseveryhour.Thebadairwasdeliveredtothevolunteersthroughan“oxygentype”facemask.Theexperimentwasthenrepeated,witheachvolunteertakingaBvitamins
5、upplementdailymadeupof2.5mgoffolicacid,50mgofvitaminB6,and1mgofvitaminB12.B6canbefoundinliver,chickenandnuts,andB12infish,meat,eggs,milkandsomecereals.TheresearchersfoundthatfourweeksofBvitaminsupplementsreducedthedamageofPM2.5exposureby28%－76%.Theresultshighlighthowpreventionata
6、nindividuallevelcouldbeusedtofighttheharmfuleffectsofPM2.5.【解题导语】 本文是一篇说明文。吸入人体内的PM2.5(细颗粒物)会导致疾病。不过，研究发现维生素B在一定程度上能降低PM2.5的危害。1．WhyisPM2.5harmfultoourhealth?A．Itpollutesandpoisonstheair.B．Itistoomuchtobegotridof.C．Itcarriesvirusesanddiseases.D．Itiseasilybreathedinanddamagesourbo
7、dy.D 解析：细节理解题。根据第二段中的“Theseparticlesaresosmall...inflammation(炎症)andstress.”可知，PM2.5(细颗粒物)很小，能进入我们的呼吸系统，导致肺部和全身炎症。2．WhatcanweinferfromParagraph3?A．Theprocessoftheresearchwasnotscientific.B．Thiskindofresearchhasbeendonemanytimes.C．Furtherstudiesareneededtoconfirmtheirfindings.D．Vi
8、taminBishardtoobtaininpeople’sdailylife.
