有关连接词的语法填空(参考资料).doc

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1、(1)Influenza,orflu,isacommoninfectionofthenoseandthroat,andsometimesthelungs.Thecauseisavirus[1]_______passesfromonepersontoanother.Thevirusspreadsthroughtheair[2]______aninfectedpersonexpelsairsuddenly.Medicalexpertshaveidentifiedthreemajorkindsofinfluenza

2、.TheycallthemtypeA,BandC.TypeCistheleastserious.Peoplemaynotevenknowtheyhaveit.[3]______researchersstudytheothertwokindsveryclosely.Viruseschangetosurvive.Thiscanmakeitdifficultforthebodytorecognize[4]_______fightaninfection.Aperson[5]_____hassufferedonekin

3、dofflucannotdevelopthatsamekindagain.Thebody’sdefensesystemproducesantibodies（抗体）.Thesesubstancesstayinthebloodanddestroythevirus[6]______itappearsagain.[7]______thebodymaynotrecognizeafluvirus[8]________hasevenasmallchange.Eachyear,researchersdevelopvaccin

4、es（疫苗）topreventthespreadofthefluvirus.TheWorldHealthOrganizationholdsmeetingsin[9]______expertsdiscuss[10]______kindsoffluvirusestoincludeinthenextvaccine.keys1.that/which。引导定语从句并在从句中作主语。2.when。引导状语从句。“当感染者突然呼气时，病毒就传播到空气中。”3.But。转折关系。C型流行性感冒不为人所觉察，但研究人员认真研究

5、另外两种。4.and。“识别并与感染作斗争”，并列关系。5.who。引导定语从句并在从句中作主语。6.if/when。引导状语从句。7.But。抗体能破坏病毒，但当病毒有细微改变时身体却无法识别它，转折关系。8.that/which。引导定语从句并在从句中作主语。9.which。引导定语从句。inwhich指代inthemeeting。10.what。引导宾语从句。专家讨论下一代疫苗将包含哪些流感病毒。(2)Americanscientistshavediscoveredthatwalnuttreescanp

6、roducemorethanwalnuts.Thescientistssaywalnuttreesalsocanmakeachemicalformofthepopularpain-killingmedicineaspirin.Thetreesdothisunderthestressofdisease[1]____otherthreats.Scientistssaythechemicalmayhelpthetreesreducedamagefromdryweather,unseasonabletemperatu

7、res[2]____otherchangesintheenvironment.Theresultsareimportant[3]_________presenceofthechemicalcouldwarngrowersearly[4]______atreeisindanger.Growerscouldrecognizeaproblem[5]_____leavesonwalnuttreesdieandfalloff.Thescientistssaidthefindingsalsoshow[6]_____apl

8、antcancommunicatewithotherplantsthroughtheatmosphere.Forexample,atreecouldcommunicate[7]_______itisunderattackfrominsects.Withthatinformation,agrowercouldbegincorrectivetreatment.Researchershaveknownfo