B)<em>Readthefollowingpassageandinfilleachblankwithonewordinoneofthefollowingthreeways</em><em>：</em><em>①</em><em>accordingtothecontext</em><em>,</em><em>②</em><em>usingthecorrectformofthewords</em><em>,</em><em>or</em><em>③</em><em>accordingtothegivenletter(s)oftheword</em><em>.</em>(阅读下面的短文，用以下三种形式之一完成短文填空：①根据上下文填空；②用所给单词的正确形式填空；③根据单词所给字母填空。每空一词。)<br/><alone></alone>Choleraisadiseasespreadbydirtywater,eitherwhenpeopledrinkthewater,(51)______eatfoodwhichhasbeenwashedinthewater,andnot(52)______(proper)cooked.Unfortunately,untilthemid19thcentury,peoplebelievedthatthedisease(53)t______throughtheair.Inthe(54)______(crowd)citiesof19th-centuryBritain,choleraspreadeasily.Mostdoctorswronglybelievedthatfreshairandabetterdietwould(55)p______thedisease.Hugefireswereusuallylitinthestreetstodrive(56)______theinfection,andtheclothesofvictimswerealsoburned.Thestreetswerealsocleanedthoroughly(57)w______powerfulchemicals.However,peoplecontinuedtosufferdreadfully.In1854,adoctorinLondon,JohnSnow,announcedwithcertaintythatcholeraspreadthrough(58)i______drinkingwater.Hedidthisbycarefully(59)______(collect)statisticsabouttheinfectioninonepartofLondon.Hemanagedtoprovethatthewaterwas(60)______(entire)responsibleforcholerainfection.