Nooneunderstoodcholeraandeverytimeitcame,thousandsdied....
问题详情：Nooneunderstoodcholeraandeverytimeitcame,thousandsdied.Neitheritscause61.______itscurewasunderstood.QueenVictoria'sdoctor,JohnSnow,wantedtofind62.______howitwascaused.WhenthediseasecametoLond...