1英语阅读理解推理判断之写作意图题真题感悟：（2018・北京，C）Plastic-EatingWormsHumansproducemorethan300milliontonsofplasticeveryyear.Almosthalfofthatwindsupinlandfills（垃圾填埋场），andupto12milliontonspollutetheoceans.Sofarthereisnoeffectivewaytogetridofit，butanewstudysuggestsananswermaylieinthestomachsofsomehungryworms.ResearchersinSpainandEnglandrecentlyfoundthatthewormsofthegreaterwaxmothcanbreakdownpolyethylene，whichaccountsfor40%ofplastics.Theteamleft100waxwormsonacommercialpolyethyleneshoppingbagfor12hours，andthewormsconsumedandbrokedownabout92milligrams，oralmost3%ofit.Toconfirmthattheworms'chewingalonewasnotresponsibleforthepolyethylenebreakdown，theresearchersmadesomewormsintopaste（糊状物）andappliedittoplasticfilms.14hourslaterthefilmshadlost13%oftheirmass—apparentlybrokendownbyenzymes（酶）fromtheworms'stomachs.TheirfindingswerepublishedinCurrentBiologyin2017.FedericaBertocchini，co-authorofthestudy，saystheworms'abilitytobreakdowntheireverydayfood—beeswax—alsoallowsthemtobreakdownplastic.“Waxisacomplexmixture，butthebasicbondinpolyethylene，thecarbon-carbonbond，isthereaswell，”sheexplains.“Thewaxwormevolvedamethodorsystemtobreakthisbond.”JenniferDeBruyn，amicrobiologistattheUniversityofTennessee，whowasnotinvolvedinthestudy，saysitisnotsurprisingthatsuchwormscanbreakdownpolyethylene.Butcomparedwithpreviousstudies，shefindsthespeedofbreakingdowninthisoneexciting.Thenextstep，DeBruynsays，willbetoidentifythecauseofthebreakdown.Isitanenzymeproducedbythewormitselforbyitsgutmicrobes（肠道微生物）？Bertocchiniagreesandhopesherteam'sfindingsmightonedayhelpemploytheenzymetobreakdownplasticsinlandfills.Butsheexpectsusingthechemicalinsomekindofindustrialprocess—notsimply“millionsofwormsthrownontopoftheplastic.”语篇解读本文是一篇说明文。作者介绍了一项科学发现：一种吃塑料的虫子——大蜡螟，它胃中的酶能够降解塑料，从而为人们解决塑料污染问题提供新的途径。246．Whatisthemainpurposeofthepassage?A．Toexplainastudymethodonworms.B．Tointroducethedietofasp...
