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1、Unit2Theenvironment一、阅读理解。Vinegarmakessalad,friesanddumplingstastebetter,andyoucanevenuseittocleanyourwindows.Andnow,accordingtoscientists,itmayeventheplanet’spopulationsurviveclimatechange.ResearchersfromtheRIKENCenterforSustainableResourceScience(CSRS)inJapanfoun
2、dthatgrowingplantsinvinegarmakesthemmoreresistanttodroughts.Thiscouldmeanthatinthefuture,worriesaboutclimatechangeaffectingtheworld’ssupplyoffoodwillbemuchlower.ThediscoverywasmadeaftertheresearchersstudiedtheArabidopsis,aplantknownforitsabilitytosurviveindryweathe
3、r.Itwasfoundthatwhentheplantwasplacedindrought-likeconditions,itproducedachemicalcalledacetate（醋酸盐）—themaincomponentofvinegar.Afterdiscoveringthis,thescientistsexperimentedfurtherbyaddingacetatetothesoilofotherplants,beforetheystoppedgivingthemwatercompletely.After
4、leavingtheplantsfor14days,theyfoundthattheonestreatedwithacetatehadsurvived,whiletheuntreatedplantshaddriedupanddied.It’shopedthatthissimplemethodofsurvivalcouldsoonbeusedtohelpfarmersindrycountrieskeeptheircropsalive."Intheexperiment,wetargetedthestaplefoodsofthew
5、orld—rice,wheatandmaize—andthebasicplantofbreedingspecies,rapeseed（油菜籽）,"JongMyongKim,co-authorofthestudy,toldPopularSciencemagazine.Kimalsotoldthemagazinehe’salreadybeenintouchwithpeopleallovertheworldwhoareinterestedintryingthissimpleandcost-effectivemethodoutfor
6、themselvesfromflowergrowingcompaniestoamateurgardeners.Althoughatthispointkeepingthirstyplantsaliveisn’taseasyasjustpouringvinegaroverthem,Kimsaidheandhisteamareworkingonmakingtheprocessassimpleaspossible."Nowwearetryingtocooperatewithsomefarmers,andalsosomecompani
7、es,tomakeamethodtoapplythissystem,"hesaid.Andforthoseofuswhoalwaysforgettoaskourneighborstowaterourplantswhenwegoaway,hopefullythismeanstheendofreturning13homefromatriptofindourfavoriteflowershavedied.1.Whatisthearticlemainlyabout?A.Theworld’sfoodsupplywillbeincrea
8、sed.B.Plantsbettersurvivedroughts.C.TheArabidopsisisresistanttodroughts.D.Vinegarcouldbeusedtofightdroughts.2.Itwasdiscoveredthatacetatecan.A.beu
