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1、试题解析：本文讲述了1957年发现的一种新的流感病毒——亚洲流感以及它的传播过程。 In1957adoctorinSingaporenoticedthathospitalsweretreatinganunusualnumberofinfluenza-likecases.Influenzaissometimescalled“flu”ora“badcold”.Hetooksamplesfromthethroatsofpatientsinhishospital and wasabletofindthevirus(
2、病毒)ofthisinfluenza. Therearethreemaintypesoftheinfluenzavirus.ThemostimportantofthesearetypeAandB,eachofthemhavingseveralsubgroups.WiththeinstrumentsatthehospitalthedoctorrecognizedthattheoutbreakwasduetoavirusingroupA,buthedidnotknowthesubgroup.Thenherepo
3、rtedtheoutbreaktotheWorldHealthOrganization (WHO) inGeneva.WHOpublishedtheimportantnewsalongsidereportsofasimilaroutbreakinHongKong,whereabout15～20%ofthepopulationhadbecomeill. AssoonastheLondondoctorsreceivedthepackageofthroatsamples,doctorsbeganthestand
4、ardtests.Theyfoundthatbyreproducingitselfwithveryhighspeed,thevirushadgrownmorethanamilliontimeswithintwodays.Continuingtheircarefultests,thedoctorscheckedtheeffectofdrugsagainstalltheknownsubgroupsofvirustypeA.Noneofthemgaveanyprotection.This,then,wassometh
5、ingnew,anewinfluenzavirus,againstwhichthepeopleoftheworldhadnohelpwhatever.Havingfoundthevirustheywereworkingwith,thetwodoctorsnowdroppeditintothenosesofsomespeciallyselectedanimals,whichgetinfluenzamuchashumanbeingsdo.Inashorttimetheusualsignsofthediseaseap
6、peared.Theseexperimentsprovedthatthenewviruswaseasytocatch,butthatitwasnotakiller.Scientists,likethegeneralpublic,callitsimplyAsianflu. Thefirstdiscoveryofthevirus,however,wasmadeinChinabeforethediseasehadappearedinothercountries.Variousreportsshowedthatthe
7、influenzaoutbreakstartedinChina,probablyinFebruaryof1957.BythemiddleofMarchithadspreadalloverChina.TheviruswasfoundbyChinesedoctorsearlyinMarch.ButChinawasthennotamemberofWHOandthereforedidn’treportthediseasetoit.Notuntiltwomonthslater,whenthevirusspreadtoSi
8、ngapore,didthenewsoftheoutbreakreachtherestoftheworld.Bythistimeitwasstartedonitswayaroundtheworld. 56. AsthedoctorinSingaporefoundthedisease,he________.A) reportedtheoutbreaktoWHO√B) foundthes
