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1、Unit4HowMuchDoYouKnowaboutPlantdiseases?I.FocusonthetopicII.VocabularystudyIIII.ReadingoneIV.Task-drivenpracticeV.ReadingtwoVI.WritingHowMuchDoYouKnowaboutPlantdiseases?IVII.DoItYourself(D.I.Y.)Part1Focusonthetopic◆Pleaselistwordsorphrasesabouttheabovepic
2、tures.◆Doyouthinktheyaregoodorharmfulfortheplants?◆Generallyspeaking,whatarethewaystoavoidtheseplantdiseases?◆Dosomeresearchandlistthenamesofotherplantdiseases?Part2Vocabularystudy1.Readthesentences.Thencirclethedefinitionoftheboldfacedwords.(1)Theplantdi
3、seasereferstotheplantaffectedbybioticandabioticfactors.Climateandchemicalpollutionshouldbeincludedintheabioticfactors.Theabioticfactorsare_________.a.nonlivingfactorsb.thelivingfactors(2)Graymoldmakesthevegetablesthrowofftheirediblevalues;Whensomethingise
4、dible,itis___________.a.uselessb.notdangeroustoeat(3)Powderymildewharmsavarietyofornamentalplants.Whentheplantsareornamental,theyare____________.a.uselessb.attractiveanddecorativePart2Vocabularystudy(4)Infectiousdiseaseiscausedbybio-pathogenincludingfungu
5、s,bacteria,virus,plantnematodediseaseandparasiticseedplantetc.Infectiousdiseaseisadisease_________.a.canbetransmittedbyakindofcontactb.canbeeasilyandtimelyfound(5)Non-infectiousdiseaseiscausedbynon-livingthings,suchasnutrientdeficiency,thelackorexcessofmo
6、isture.Deficiencyis_________.a.sufficiencyb.thelackof(6)Heroldcarwasunreliable,sothetripwasunpleasantbybreakdowns.Ifsomethinghasabreakdown,it__________.a.stillworksb.stopsworkingPart2Vocabularystudy(7)Bacterialinfectioncausesswelling,discoloration,andthen
7、abadsmell.Discolorationisusedtodescribedsomething_________.a.moreattractiveb.lessattractive;losttheoriginalcolor(8)Theroseswiltedthedayaftersheboughtthem.Ifaplantwilts,itgradually_________.a.growsupandbecomesstrongb.bendsdownwardsandbecomesweak(9)Don’teat
8、somanycandies;theycanrotyourteeth.Whensomethingrotsit,itbecomes_________.a.worseb.betterPart2Vocabularystudy(10)Hedoesn’tlikeanyonetomentionhisdeformity.Whenweusedeformity,itrefersto_________.a.unhappyfeelingb.anabn
