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1、高考英语《流行话题语境识词4500》Unit64 TheStoryofCorn素材Unit64 TheStoryofCorn Before1492,whenColumbus"discovered"America,noonelivinginEuropeknewcornexisted.Uptothistime,corngrewonlyintheAmericas.ScientistsbelievedcornwasoriginallycultivatedbyIndiansinthehighlandsofMexicothousandsofyear
2、sago.AmericanIndiansweregrowingcorninmanypartsofNorthAmericalogbeforethefirstarrivalofEuropeanexplorersandtraders.ChristopherColumbusandtheexplorersthatfollowedhimtookcornbacktoEuropeandintroducedittotheworld.NativeAmericanIndianstaughtEuropeancoloniststogrowmanyvarietieso
3、fthecornincludingyellow,re,blue,pink,andblackkernels.Astimewenton,thenewsettlestoAmericabegantodependoncornasoneofthemostimportantfarmcrops.Americanfarmershavealwayswantedtogrowstronghealthycornplantsthatyieldasmuchaspossible.Inthelater1800sscientistsworkedonthedevelopment
4、ofhybridcorn.Thisresearchledtobettervarietiesofcornandhigheryields. Didyouknowcornisusedtohelpproduceantibiotics,babyfoods,condensedmilk,somefruitjuicesandevenpeanutbutter?Fromthecornsyrupinyoursodapoptothousandsofproducts--animalfeed,humanfood,drugs,cosmetics,cornsweeten
5、erandcleansers,justtonameafew.Beyonditsfoodandconsumerproductuses,cornisreplacingpetroleuminmanyindustrialapplications,fromplasticcontainerstoclean-burningethanol.Becausecornproductsareabiodegradableandrenewablenaturalresource,theyarebetterfortheenvironmentthantheirpetrole
6、umcounterparts. CornandproductsmadefromcornimprovethelivesofAmericansinthousandsoflittleway.Ifcornanditsproductsweren'tavailable,manycommonproductswouldbelessuseful,moreexpensive,evenunavailable.HerearesomeexamplesofthelittleannoyancesandbiggerproblemsAmericanswouldfacewi
7、thoutcorn:Nofreezingpizza.Freezingpizzaisaproblem,becausethemoistureinthesaucecanmigrateintothecrust,makingitsosoggythatit'sunappealingtoeat.Modifiedcornstarchisusedtoprovideabarrierthatpreventswatermigrationandkeepsthecrustcrisp.Onalow-fatdiet?Saythankyouforcorn.Manylow-f
8、atfoodsdependoncorn-derivedfoodstarchestoprovidequalitiesthatusedtocomefromfats.Examplesi
