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1、.阅读理解(建议用时:25分钟)A体裁议论文题材禽流感的防治词数373Tiredness,coughing,arunnynoseandasorethroat—amongallsicknessesthereisprobablynonemorecommonthantheflu,whichweallgetnowandthen.However,birdfluisacompletelydifferentstory.Tenyearsago,theH5N1birdflusweptacross15countries,includingChina,withsufferersreportingchestpa
2、in,difficultybreathing,feverandseverecoughing.Morethan600peoplewereinfected,andabout60percentdied.NowanothertypeofbirdfluhitShanghaiandthreeneighboringprovinces,andthistimethevirusiscalledH7N9.BytheafternoonofApril11,thenewvirushadtakenninelivesoutof35infected,accordingtoXinhuaNewsAgency.The“H”an
3、d“N”inthevirus’namereferstotwokindsofproteinsonthesurfaceofthevirus.Anychangeofthenumbersofthetwoproteinsindicatesanewmutation(变异).Mostofthemutationsonlyaffectbirds,suchaschickensandpigeons,anddon’tnormallyspreadtohumans.Butoncetheydo,theresultscanbedisastrous.“Anytimeananimalinfluenzaviruscrosse
4、stohumans,itisacauseforconcern,”MalikPeiris,virologist(病毒学家)attheUniversityofHongKong,toldNaturemagazine.TaketheSARSepidemic(传染病)10yearsagoasanexample.Thevirusbehindthediseaseisthoughttohavejumpedtohumansfromanimals.Theviruswasacomplete“stranger”tohumanbodies,whichhadn’tdevelopedanimmunityagainst
5、it.ButthereissomethingmoreaboutthenewH7N9birdflu.UnliketheH5N1birdflu,whichcausesseveresicknessinbirds,theH7N9hasbeenevolvingundertheradar(悄悄地)sinceittravelsbetweenbirdswithoutcausingnoticeableillness.Thatmakesitdifficulttokeeptrackofthedisease.Thegoodnewsisthatthere’ssofarnosignthatthevirusisspr
6、eadingfrompersontoperson.Butsincethereisnovaccineforthediseaseyet,theWorldHealthOrganizationrecommendsthatyouwashyourhandsaftermeetingwithsickpeopleandbeforeandafteryoueat.orpreparefood,andtheyalsosuggestavoidingcontactwithbirdsortheireggs.1.WhichofthefollowingstatementsisTRUEaccordingtothetext?A
7、.TheH5N1birdfluturnedouttohavesomethingtodowiththeSARSepidemic.B.Morethan600peopleacrosstheworlddiedfromtheH5N1birdflutenyearsago.C.Mostofthemutationsoftheproteinsinthebirdfluvirusareharmfultobothbirdsandhumans.D.Thena