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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,withsufferersreportingches
2、tpain,difficultybreathing,feverandseverecoughing.Morethan600peoplewereinfected,andabout60percentdied.NowanothertypeofbirdfluhitShanghaiandthreeneighboringprovinces,andthistimethevirusiscalledH7N9.BytheafternoonofApril11,thenewvirushadtakenninelivesoutof35infected,accordingtoXinhuaNewsAgency.T
3、he“H”and“N”inthevirus’namereferstotwokindsofproteinsonthesurfaceofthevirus.Anychangeofthenumbersofthetwoproteinsindicatesanewmutation(变异).Mostofthemutationsonlyaffectbirds,suchaschickensandpigeons,anddon’tnormallyspreadtohumans.Butoncetheydo,theresultscanbedisastrous.“Anytimeananimalinfluenza
4、viruscrossestohumans,itisacauseforconcern,”MalikPeiris,virologist(病毒学家)attheUniversityofHongKong,toldNaturemagazine.TaketheSARSepidemic(传染病)10yearsagoasanexample.Thevirusbehindthediseaseisthoughttohavejumpedtohumansfromanimals.Theviruswasacomplete“stranger”tohumanbodies,whichhadn’tdevelopedan
5、immunityagainstit.ButthereissomethingmoreaboutthenewH7N9birdflu.UnliketheH5N1birdflu,whichcausesseveresicknessinbirds,theH7N9hasbeenevolvingundertheradar(悄悄地)sinceittravelsbetweenbirdswithoutcausingnoticeableillness.Thatmakesitdifficulttokeeptrackofthedisease.Thegoodnewsisthatthere’ssofarnosi
6、gnthatthevirusisspreadingfrompersontoperson.Butsincethereisnovaccineforthediseaseyet,theWorldHealthOrganizationrecommendsthatyouwashyourhandsaftermeetingwithsickpeopleandbeforeandafteryoueat-7-orpreparefood,andtheyalsosuggestavoidingcontactwithbirdsortheireggs.1.Whichofthefollowingstatementsi
7、sTRUEaccordingtothetext?A.TheH5N1birdfluturnedouttohavesomethingtodowiththeSARSepidemic.B.Morethan600peopleacrosstheworlddiedfromtheH5N1birdflutenyearsago.C.Mostofthemutationsoftheproteinsinthebirdfluvirusareharmfultobothbirdsandhumans.D.Then