![Before1900,manytheoriesexistedastothecauseofyellowfever...]( "Before1900,manytheoriesexistedastothecauseofyellowfever...")
- 問題詳情：Before1900,manytheoriesexistedastothecauseofyellowfever(黃熱病).Somedoctorsweresurethediseasewasair-borne;othersfeltthatitwasspreadfrompersontoperson.Dr.CarlosFinlay,awell-knownCubandoctorofthattime,hadlongheldthetheorythatitwascausedbythebit...
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