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UNIT1JOHNSNOWDEFEATS“KINGCHOLERA”JohnSnowwasafamousdoctorinLondon—soexpert，indeed，thatheattendedQueenVictoriaasherpersonalphysician.Buthebecameinspiredwhenhethoughtabouthelpingordinarypeopleexposedtocholera.Thiswasthedeadlydiseaseofitsday.Neitheritscausenoritscurewasunderstood.Somanythousandsofterrifiedpeoplediedeverytimetherewasanoutbreak.JohnSnowwantedtofacethechallengeandsolvethisproblem.Heknewthatcholerawouldneverbecontrolleduntilitscausewasfound.Hebecameinterestedintwotheoriesthatpossiblyexplainedhowcholerakilledpeople.Thefirstsuggestedthatcholeramultipliedintheair.Acloudofdangerousgasfloatedarounduntilitfounditsvictims.Thesecondsuggestedthatpeopleabsorbedthisdiseaseintotheirbodieswiththeirmeals.Fromthestomachthediseasequicklyattackedthebodyandsoontheaffectedpersondied.JohnSnowsuspectedthatthesecondtheorywascorrectbutheneededevidence.SowhenanotheroutbreakhitLondonin1854，hewasreadytobeginhisenquiry.Asthediseasespreadquicklythroughpoorneighbourhoods，hebegantogatherinformation.Intwoparticularstreets，thecholeraoutbreakwassoseverethatmorethan500peoplediedintendays.Hewasdeterminedtofindoutwhy.Firsthemarkedonamaptheexactplaceswhereallthedeadpeoplehadlived.Thisgavehimavaluableclueaboutthecauseofthedisease.ManyofthedeathswerenearthewaterpumpinBroadStreet(especiallynumbers16,37,38and40)．Healsonoticedthatsomehouses(suchas20and21BroadStreetand8and9CambridgeStreet)hadhadnodeaths.Hehadnotforeseenthis，sohemadefurtherinvestigations.Hediscoveredthatthesepeopleworkedinthepubat7CambridgeStreet.Theyhadbeengivenfreebeerandsohadnotdrunkthewaterfromthepump.Itseemedthatthewaterwastoblame.Next，JohnSnowlookedintothesourceofthewaterforthesetwostreets.HefoundthatitcamefromtheriverpollutedbythedirtywaterfromLondon.HeimmediatelytoldtheastonishedpeopleinBroadStreettoremovethehandlefromthepumpsothatitcouldnotbeused.Soonafterwardsthediseasesloweddown.Hehadshownthatcholerawasspreadbygermsandnotinacloudofgas.InanotherpartofLondon，hefoundsupportingevidencefromtwootherdeathsthatwerelinkedtotheBroadStreetoutbreak.Awoman，whohadmovedawayfromBroadStreet，likedthewaterfromthepumpsomuchthatshehaditdeliveredtoherhouseeveryday.Bothsheandherdaughterdiedofcholeraafterdrinkingthewater.WiththisextraevidenceJohnSnowwasabletoannouncewithcertaintythatpollutedwatercarriedthevirus.Topreventthisfromhappeningagain，JohnSnowsuggestedthatthesourceofallthewatersuppliesbeexamined.Thewatercompanieswereinstructednottoexposepeopletopollutedwateranymore.Finally“KingCholera”wasdefeated.约翰·斯诺战胜“霍乱王”约翰·斯诺是伦敦一位著名的医生——他的确医术精湛，以至于成了照料维多利亚女王的私人医生。但当他一想到要帮助(那些)得了霍乱的普通百姓时，就感到很受鼓舞。霍乱在当时是最致命的疾病。人们既不知道它的病因，也不懂如何治疗。每次爆发霍乱时就有成千上万惊恐的人病死。约翰·斯诺想面对这一挑战，解决这一问题。他知道在找到病源之前，霍乱疫情是无法控制的。他对霍乱致人死地的两种推测产生了兴趣。第一种看法是霍乱病毒在空气中繁殖，像一股危险气体在空中到处漂浮，直到找到病毒的受害人。第二种看法是人们是在吃饭时把这种病毒引入体内的。病毒从胃部开始迅速殃及全身，患者就会很快地死去。约翰·斯诺推测第二种说法是正确的，但需要有证据。因此在1854年伦敦再次爆发霍乱时，他就着手准备对此调研。当霍乱在贫民区迅速蔓延时，约翰·斯诺开始搜集信息。他发现特别在两条街上霍乱流行得很严重，以至于10天内就有500多人死亡。他决心查清原因。他首先在地图上标注出所有死者曾住过的确切地点。该图提供了一条说明霍乱起因的很有价值的线索。许多死者都住在布洛德街上的水泵附近(尤其是这条街上的16、37、38和40号)。他还发现有些住户(如布洛德街20号和21号及剑桥街8号和9号)却无人死亡。他未预料到这种情况，于是他做了进一步调查。他发现这些人是在剑桥街7号的酒馆里打工。酒馆为他们供应免费啤酒，因此他们没喝布洛德街水泵里的水。看来水是罪魁祸首。接下来，约翰·斯诺调查了这两条街上的水源。他发现水来自于河里，这条河被伦敦排出的脏水污染了。约翰·斯诺立即告诉布洛德街上惊慌失措的人们拆掉水泵的把手，这样水泵就用不成了。不久，疫情就开始得到缓解。他证明了霍乱是通过细菌传播而非气团传播。在伦敦的另一地区，他从另外两例与布洛德街疾病爆发有关的死亡病例中得到了有力的证据。一个妇女，从布洛德街搬走了，但她非常喜欢水泵的水，她让人每天从水泵给她家送水。她和她的女儿在喝了这些水后，都死于霍乱。利用这个额外证据，约翰·斯诺就可以很有把握地宣布污染水携带病菌。为防止这种情况再度发生，约翰·斯诺建议，所有水源都要经过检测。供水公司也得到指示再也不能让人们接触污染水了。“霍乱王”终于被击败了。PUZILESINGEOGRAPHYPeoplemaywonderwhydifferentwordsareusedtodescribethesefourcountries：England，Wales，ScotlandandNorthernIreland.YoucanclarifythisquestionifyoustudyBritishhistory.FirsttherewasEngland.Waleswaslinkedtoitinthethirteenthcentury.NowwhenpeoplerefertoEnglandyoufindWalesincludedaswell.NextEnglandandWaleswerejoinedtoScotlandintheseventeenthcenturyandthenamewaschangedto“GreatBritain”．HappilythiswasaccomplishedwithoutconflictwhenKingJamesofScotlandbecameKingofEnglandandWalesaswell.FinallytheEnglishgovernmenttriedintheearlytwentiethcenturytoformtheUnitedKingdombygettingIrelandconnectedinthesamepeacefulway.However，thesouthernpartofIrelandwasunwillingandbrokeawaytoformitsowngovernment.SoonlyNorthernIrelandjoinedwithEngland，WalesandScotlandtobecometheUnitedKingdomandthiswasshowntotheworldinanewflagcalledtheUnionJack.Totheircreditthefourcountriesdoworktogetherinsomeareas(eg，thecurrencyandinternationalrelations)，buttheystillhaveverydifferentinstitutions.Forexample，NorthernIreland，EnglandandScotlandhavedifferenteducationalandlegalsystemsaswellasdifferentfootballteamsforcompetitionsliketheWorldCup!Englandisthelargestofthefourcountries，andforconvenienceitisdividedroughlyintothreezones.ThezonenearestFranceiscalledtheSouthofEngland，themiddlezoneiscalledtheMidlandsandtheonenearesttoScotlandisknownastheNorth.Youfindmostofthepopulationsettledinthesouth，butmostoftheindustrialcitiesintheMidlandsandtheNorthofEngland.Although，nationwide，thesecitiesarenotaslargeasthoseinChina，theyhaveworldfamousfootballteamsandsomeofthemevenhavetwo！Itisapitythattheindustrialcitiesbuiltinthenineteenthcentu