高中英语GreatscientistsSectionⅠWarmingUp&ReadingPre_reading课件.pptx

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1、JohnSnowDefeats“KingCholera”Aboutcholera·Itwasa(1)______diseaseofitsday.·Peopledidn’tknowitscauseorits(2)____.·Manythousandsofpeoplediedeverytimetherewasanoutbreak.Two(3)________·Cholerawasspreadinacloudofgas.·Cholerawasspreadbygerms.JohnSnow’sopinionCholerawass

2、preadbygerms.JohnSnowDefeats“KingCholera”Thecourseoffindingevidence·Asthediseasespreadquicklythroughpoor(4)_______________ofLondon,hebegantogatherinformation.·Hefoundtheoutbreakwasparticularly(5)______intwostreets.·Afterfurtherinvestigationshediscovereditseemedt

3、hatthewaterwasto(6)______.·Whenpeopledidn’tusethe(7)________water,thediseasesloweddown,whichshowedthatcholerawasreallyspreadbygerms.(8)_________topreventcholerafromhappening·JohnSnowsuggestedthatthe(9)_______ofallthewatersuppliesbeexamined.·Thewatercompanieswere

4、(10)__________nottoexposepeopletopollutedwateranymore.