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1、TheOlympicGames【阅读理解插花】VitaminBcouldhelpreducetheeffectsofthemostdangeroustypeofairpollution,accordingtoanewstudypublishedonMonday.Inthefirststudyofitskind,ateamofinternationalresearcherslookedintothedamagecausedbyoneofthepollutantsthathavetheseverestimpactonhealth—P
2、M2.5.TheyfoundthatVitaminBsupplementcouldeffectivelyreducetheimpactofthetinyparticles(颗粒)onthehumanbody,althoughtheystressedthattheresearchwasinitsearlystages.AccordingtotheWHO,92%oftheworld’speoplearelivinginplaceswherethePM2.5levelgoesbeyondtheremendedlevel.Soit’su
3、rgenttofindasolutiontotheproblem.Accordingtothisstudy,publishedinthePNAS,10volunteerswereinitiallyexposedtocleanairandgivenaplacebo(安慰剂)tochecktheirbaselineresponses.ThegroupthenkeptontakingplacebosforfourweeksbeforebeingexposedtoheavilypollutedairfromdowntownToronto
4、,whereanestimated1,000carspassedeveryhour.Thebadairwasdeliveredtothevolunteersthroughan“oxygentype”facemask.Theexperimentwasthenrepeated,witheachvolunteertakingaVitaminBsupplementdaily,madeupof2.5mgoffolicacid,50mgofVitaminB6,and1mgofVitaminB12.VitaminB6canbefoundinl
5、iver,chicken,nutsandotherthings,andVitaminB12infish,meat,eggs,milkandsomecereals.TheresearchersfoundthatfourweeksofVitaminBsupplementsreducedthedamageofPM2.5effectsby28-76%.TheresultsemphasizedhowpreventionatanindividuallevelcouldbeusedtofightagainstthedamageofPM2.5,
6、theresearcherssaid.【文章大意】本文主要通过一些实验告诉我们维生素B对减轻PM2.5对身体的伤害有什么样的功效。1.What’sthenewlydiscoveredeffectofVitaminBinParagraph1?A.Itcanbeusedtoreplaceothervitaminsinourdailylife.B.Itcanhelplowertheairpollutionlevelintheopenair.C.ItcanreducetheimpactofPM2.5onhumanbodies.D.Itc
7、angetridofthepollutantsremaininginourbodies.【解析】选C。细节理解题。根据第一段“VitaminBcouldhelpreducetheeffectsofthemostdangeroustypeofairpollution,accordingtoanewstudypublishedonMonday.”,可知维生素B可以减少造成空气污染的危险物质的影响,而后一句又提到了对健康危害最大的危险物质是PM2.5,故选C。2.Whatcanbelearnedfromthesecondparagra
8、ph?A.FurtherstudyabouttheeffectofVitaminBneedstobedone.B.VitaminBisthemostimportanttohuman’shealth.C.Thetinyparticlesintheairaremad
