2020版高考英语一轮总复习课时作业21Unit1Greatscientists（含解析）新人教版必修5

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1、课时作业　Ⅰ.阅读理解(2019·康杰中学高三模拟)Theyear2018willmarkthe100thanniversaryofthedeadliestinfluenzaoutbreakinhistory.Itisestimatedthattheinfluenzapandemic(瘟疫)of1918killedmorethan50millionpeoplearoundtheworld.Otherestimatesgomuchhigher.Becauseofalackofmedicalrecordkeeping

2、,wemayneverknowtheexactnumber.Theinfluenzawasafastkiller.Somevictimsdiedwithinhoursoftheirfirstsymptoms.Othersdiedafterafewdays.“Theirlungsfilledwithliquidandtheychokedtodeath.”The1918flupandemicwasalsodifferentfromotheroutbreaks.Itstruckmanyyoung,healthypeop

3、le.Virusesusuallyaffectsickoroldpeople.Althoughmodernmedicineeffectivelycontrolsmanydiseases,influenzaremainsdifficulttoprotectagainst.TheWorldHealthOrganizationestimatesthateveryyearinfluenzakills250,000to500,000peoplearoundtheworld.Eachyear,medicalscientist

4、sdevelopfluvaccines(疫苗)whichofferimmunity(免疫)fromsomeinfluenzaviruses.Buttheycanonlyguesswhichformoftheviruswillspread.Healthofficialsremainconcernedaboutanotherflupandemic.Newformsofthefluvirusappearregularly.Oneexamplewasthe“swineflu”orH1N1outbreakin2009.An

5、thonyFauci,DirectoroftheNationalInstituteofInfectiousDiseasesintheUnitedStatessaysthatviruscausedatruepandemic.Tostopthenextpandemic,scientistsarenowresearchinghowtocreateauniversalinfluenzavaccine.InOctober2017,VanderbiltUniversityMedicalCenterintheUSannounc

6、edtheUniversalInfluenzaVaccineInitiative.Theuniversitysaidresearchersareleadinganinternationalefforttodevelopauniversalinfluenzavaccinethatwillprotecteveryoneagainstallformsofthefluanywhereintheworld.Theuniversityaddedthatresearcherswillbegintestsinearly2018,

7、andtheHumanVaccinesProject,apublicprivatepartnership,isfundingtheproject.However,untilauniversalinfluenzavaccineisavailable,today'sseasonalfluvaccineremainsimportant.2018将是历史上最致命的流感爆发的第100周年纪念。1918年的流感大流行导致全世界超过5000万人死亡。可见流感病毒比战争更致命。为了阻止下一次大流行，科学家们正在研究如何制造一种通

8、用流感疫苗。1．Whatdoweknowabouttheinfluenzain1918?A．ItsweptacrossthewholeEurope.B．Noonesurvivedthefirstfewdays.C．Itkilledthelargestnumberofpeople.D．Itstruckonlyyoungandhealthypeople.答案：C解析：细节理解