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页数:4页
时间:2019-10-14
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1、JohnSnowwasafamousdoctorinLondon-expert,indeed,thatheattendedQueenVictoriaasherpersonal(physical).Buthebecameinspiredwhenhethoughtabouthelpingordinarypeopleexposedtocholera・Thiswasthe(die)diseaseofitsday.Neitheritscauseitscurewasunderstood・Somanythousandsofterrifiedpeoplediedeverytimewasanou
2、tbreak・JohnSnowwantedtofacethechallengeand(solve)thisproblem.Heknewthatcholerawouldnever(control)untilitscausewasfound.Hebecameinterestedintwotheoriesthat(possible)explainedhowcholerakilledpeople・Thefirstsuggestedthatcholeramultipliedintheair.Acloudofdangerousgasfloateduntilitfoundits(victim
3、).Thesecondsuggestedthatpeopleabsorbedthisdiseaseintotheirbodieswiththeirmeals.Fromthestomachthediseasequicklyattackedthebodyandsoontheaffectedpersondied.JohnSnowsuspectedthatthesecondtheorywascorrectheneededevidenee.SowhenanotheroutbreakhitLondonin1854,hewasreadytobeginhis(enquire).thedisea
4、sespreadquicklythroughpoor(neighbor),hebegantogatherinformation.Intwoparticularstreets,thecholeraoutbreakwassoseverethatmorethan500peoplediedintendays.Hewasdeterminedtofindoutwhy.Firsthemarkedonamaptheexactplacesallthedeadpeople(live).Thisgavehimvaluableclueaboutthecauseofthedisease.Manyofth
5、e(die)werenearthewaterpumpinBroadStreet(especiallynumbers16r37,38and40).Healsonoticedthatsomehouses(suchas20and21BroadStreetand8and9CambridgeStreet)(have)nodeaths.Hehadnotforeseenthis,sohemadefurtherinvestigations.Hediscoveredthatthesepeopleworkedinthepubat7CambridgeStreet.They(give)freebeer
6、andsohadnotdrunkthewaterfromthepump.Itseemedthatthewaterwastoblame.Next,JohnSnowlookedintothesourceofthewaterforthesetwostreets.HefoundthatcamefromtheriverpollutedbythedirtywaterfromLondon・HeimmediatelytoldtheastonishedpeopleinBroadStreet(remove)thehandlefromthepumpsothatitcouldnotbeused.Soo
7、nafterwardsthediseasesloweddown・He(show)thatcholerawasspreadbygermsandnotincloudofgas.InanotherpartofLondon,hefound(support)evideneefromtwootherdeathsthat(link)totheBroadStreetoutbreak・Awoman,whohadmovedawayfromBroadStreet,likedthewaterfromthepumps
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