新概念英语第四册Lesson17-19原文及翻译VIP免费

下载后可任意编辑新概念英语第四册Lesson17~19原文及翻译【导语】为了方便同学们的学习，为您精心整理了“新概念英语第四册Lesson17~19原文及翻译”，希望有了这些内容的帮助，可以为大家学习新概念英语提供帮助！假如您想要了解更多新概念英语的相关内容，就请关注吧！新概念英语第四册Lesson17原文及翻译Aman-madedisease人为的疾病Whatfactorhelpedtospreadthediseaseofmyxomatosis?Intheearlydaysofthesettlementof下载后可任意编辑Australia,enterprisingsettlersunwiselyintroducedtheEuropeanrabbit.ThisrabbithadnonaturalenemiesintheAntipodes,sothatitmultipliedwiththatpromiscuousabandoncharacteristicofrabbits.Itoverranawholecontinent.Itcauseddevastationbyburrowingandbydevouringtheherbagewhichmighthavemaintainedmillionsofsheepandcattle.Scientistsdiscoveredthatthisparticularvarietyofrabbit(andapparentlynootheranimal)wassusceptibletoafatalvirusdisease,myxomatosis.Byinfectinganimalsandlettingthemlooseintheburrows,localepidemicsofthisdiseasecouldbecreated.Lateritwasfoundthattherewasatypeofmosquitowhichactedasthecarrierofthisdiseaseandpasseditontotherabbits.Sowhiletherestoftheworldwastryingtogetridofmosquitoes,Australiawasencouragingthisone.Iteffectivelyspreadthediseasealloverthecontinentanddrasticallyreducedtherabbitpopulation.Itlaterbecameapparentthatrabbitsweredevelopingadegreeofresistancetothisdisease,sothatthe下载后可任意编辑rabbitpopulationwasunlikelytobecompletelyexterminated.Therewerehopes,however,thattheproblemoftherabbitwouldbecomemanageable.Ironically,Europe,whichhadbequeathedtherabbitasapesttoAustralia,acquiredthisman-madediseaseasapestilence.AFrenchphysiciandecidedtogetridofthewildrabbitsonhisownestateandintroducedmyxomatosis.Itdidnot,however,remainwithintheconfinesofhisestate.ItspreadthroughFrance,Wherewildrabbitsarenotgenerallyregardedasapestbutassportandausefulfoodsupply,anditspreadtoBritainwherewildrabbitsareregardedasapestbutwheredomesticatedrabbits,equallysusceptibletothedisease,arethebasisofaprofitablefurindustry.ThequestionbecameoneofwhetherMancouldcontrolthediseasehehadinvented.RITCHIECALDERScienceMakesSenseNewwordsandexpressions生词和短语下载后可任意编辑settlementn.新拓居地enterprisingadj.有事业心的settlern.移居者Antipodesn.新西兰和澳大利亚(英)promiscuousadj.杂乱的abandon下载后可任意编辑n.放任，纵情overrunv.蔓延，泛滥devastationn.破坏，劫掠burrowv.挖、掘susceptibleadj.易受感染的virusn.病毒下载后可任意编辑myxomatosisn.多发性粘液瘤infectv.传染epidemicn.流行病mosquiton.蚊虫carriern.带菌者exterminate下载后可任意编辑v.消灭ironicallyadv.具有讽刺意味地bequeathv.把...传给pestn.害虫，有害动物pestilencen.瘟疫confinen.范围下载后可任意编辑domesticatev.驯养参考译文在澳大利亚移民初期，一些有创业精神的移民不明智地把欧洲兔子引进了澳大利亚。这种兔子在澳大利亚及新西兰没有天敌，因此便以兔子所特有的杂乱交配迅猛繁殖起来。整个澳洲兔子成灾。它们在地下打洞，吃掉本可以饲养数百万头牛羊的牧草，给澳洲大陆造成了毁灭性的破坏。科学家们发现，这种特别品种的兔子(显然不包括别的动物)易患一种叫“多发性粘液瘤”的致命毒性疾病。通过让染上此病的动物在洞内乱跑，就可以使这种疾病在一个地区蔓延起来。后来又发现，有一种蚊子是传播这种疾病的媒介，能把此病传染给兔子。因此，世界上其他地方在设法消灭蚊子的时候，澳大利亚却在促使这种蚊子大量繁殖。蚊子把这种疾病扩散到整个澳洲大陆，效果甚佳，结果兔子的数目在为减少。后来，明显看出，兔子对这种疾病已产生了一定程度的免疫力，所以兔子不可能被完全消灭。但是，已有希望解决兔子所带来的问题。下载后可任...