高三英语限时阅读十八科普AThereareplentyofgoodreasonstobuyorganicproducts,butnutritionmaynotbeoneofthem,suggestsanewstudy,whichfoundnodifferenceinantioxidant(抗氧化剂)levelsbetweenorganicallyandconventionally(常规地)grownonions,carrots,andpotatoes.Thestudyonlylookedatthreetypesofvegetablesandjustafewselectnutrients.Buttheexperimentwaspartofabiggerprojectthatwassosystematicandstrictlycontrolledthatthefindingslikelyapplytoothercrops,too.“Givingpreferencetoorganicproductsbecausetheycontainmorebioactivecomponentsisdoubtfulandnotsupportedbyscientificevidence,”Knuthsensaid.“Still,therearemanygoodreasonsfortheconsumertoselectorganicfoodproducts,includingabsenceofpesticideresidues(农药残留)infoods,animalwelfare,andenvironmentalprotections.”Argumentoverwhetherorganicproduceismorenutritiousthanconventionalvarietieshasbeenaroundforatleastadecade,saidJeffreyBlumberg,directoroftheAntioxidantsResearchLaboratoryatTuftsUniversityinBoston.“Somestudieshavesuggestedthatorganicallygrownplantscontainhigherlevelsofhealthfulantioxidants,possiblybecausesomeantioxidantsactasnaturalfungicides(杀真菌剂),pesticidesandinsecticides,”hesaid.“Theideaisthat,withouthelpfromindustrialchemicals,plantsonorganicfarmsneedtoworkhardertoprotectthemselves.Theyendupbecomingmorenutritiousasaresult.”Butplentyofotherstudieshaveshownnosuchrelationship.“Iunderstandthatorganicfarmerswouldlovetobeabletosaythattheirsaresuper-fruitsandsuper-vegetablesbecausetherearehigheramountsofthesecompoundsinthem,”Blumbergsaid.“Ifyouwanttobuythembecauseyouthinkthey’resaferfortheplanettogrowthingsthatway,orbecauseyouthinkpesticidesarebadforyouoryourfamily,oryoulikethattheycomefromashorterdistanceaway,that’sgreat.”“Butifyouwanttobuythembecausethey’remorenutritious,you’reconfused,andwedon’tknowifthat’strueornot.”1.Thenewstudyprovesthat.A.thereareplentyofgoodreasonstobuyorganicproduceB.nutritionisoneofthegoodreasonstobuyorganicproduceC.someorganicallyandconventionallygrownfoodshavethesameantioxidantlevelsD.organicproduceisharmfultoourhealth2.Whydopeoplepreferorganicproducts?A.Becausetheythinkorganicproductshavenobioactivecomponents.B.Becausescientificevidencesupportsorganicproductscanmakethemstronger.C.Becauseit’sprovedthatorganicproduceismorenutritiousthanconventionalvarieties.D.Becausetheythinkorganicfoodproductshavenoharmfulthings.3.Thefourthparagraphmainlytellsus.A.it’sunclearwhetherorganicproduceismorenutritiousthanconventionalvarietiesB.organicallygrownplantscontainhigherlevelsofhealthfulantioxidantsC.plantsonorganicfarmsneedtoworkhardertoprotectthemselvesD.plentyofotherstudieshaveshownnosuchrelationship[来源:学|科|网Z|X|X|K]4.WhichisNOTthereasonforyoutobuyorganicproductsaccordingtoBlumberg?1A.Therearehigheramountsofthesecompoundsinthem.B.They’resaferfortheplanettogrowthingsthatway.C.Pesticidesarebadforyouoryourfamily.D.Theyaremorenutritious.6.CDADBThe2012LondonOlympicshadenoughproblemstoworryabout.Butonemorehasjustbeenadded—acommunicationsblackoutcausedbysolarstorms.AfteraperiodofcalmwithintheSun,scientistshavedetectedthesignsofafreshcycleofsunspotsthatcouldpeakin2012,justintimeforthearrivaloftheOlympictorchinLondon.NowscientistsbelievethatthispeakcouldresultinvastsolarexplosionsthatcouldthrowbillionsoftonsofchargedmattertowardstheEarth,causingstrongsolarstormsthatcouldjamthetelecommunicationssatellitesandin...
