2019-2020学年高中英语 Unit 4 Exploring plants Period 1 W

返回目录ExploringplantsUnit4返回目录单元话题链接ChineseDoveTreeWhetherforaplantcollectororagardenerwithatastefortheremarkable,thereismuchtorecommendinatreethatcombinesacuriousbeautywithastoriedpast.Forthoseinterestedinthehistoryofplantintroduction,fewspeciesconjuremoreimagesofturn­of­the­centuryexplorationthanthefamedDoveTree.DoveTree,alsocalledhandkerchieftree(speciesDavidiainvolucrata)(珙桐),isalovelyfloweringtree.返回目录Pyramidalinshape,withlargebright­greenleaves,itisespeciallyimpressiveinbloom.Eachterminalflowerheadisabout2centimetres(3/4inch)acrossandissubtended(使角或边对向)bytwolargebracts(苞片),oneupto16cmlongandtheotherhalfaslong,hangingfromthetreeresemblinglargehandkerchiefs.返回目录DoveTreepreferssuntopartialshadewhereitisprotectedfromthewind.Itmaytakeupto10yearsbeforethetreebeginstosetflowers.NativetoSouthCentralandSouthwestChinafromHubeitosouthernGansu,southtoGuizhou,SichuanandYunnan,ithasbeenintroducedelsewhere.返回目录Amongscarceplants,theDoveTreeisperhapsthemostfamousoneandregardedas“livingfossil”，survivedduringtheGlacieroftheFourthPeriod(2.5millionyearsago)．Botanistswerenotabletotraceitsoriginuntilthemiddleof19thcentury.IntheBadagongshanNationalNatureReservelocatedinSangzhicounty,thereexistsasmallvalleyreplete(充满)withover10,000wildDoveTrees,hencenamed“dovetreevalley”，whichboaststheworld'sbiggest“KingofDoveTree”thatis30metershighand1.5metersdiametric(直径),covering600squaremeterswithitsleavesandbranches.返回目录ThegenusDavidiaisnamedforFatherArmandDavid(1826～1900),aFrenchVincentianmissionaryandkeennaturalistwholivedinChina.Davidfirstdescribedthetreein1869asasingletreefoundatover2,000maltitude,andsentdriedspecimenstoParis.ScottishplanthunterAugustineHenryagainfoundasingletree,thistimeintheYangtseIchanggorgesandsentthefirstspecimentoKewGardens(英国皇家植物园)．PlantcollectorErnestHenryWilsonlaterfoundagrove(小树林)ofthetreesoverhangingasheerdrop.WilsonhadhisboatwreckedbutmanagedtosavehisDavidiaspecimens.返回目录PeriodⅠWarmingUpandReading返回目录课前教材预案目录Contents返回目录课前教材预案[基础自测]Ⅰ.重点单词1．_____________vt.对……授粉→_______________n．授粉→______________n．虫媒2．__________adj.异国情调的；外来的；奇异的→___________n．奇异事物，新奇事物3．___________adj.远的，远处的→____________n．距离，间距；远方；远处pollinatepollinationpollinatorexoticexoticadistantdistance返回目录4．____________n．斗争；冲突→_______________adj.相矛盾的；冲突的5．_________adj.紧的，紧密的→___________adv.紧紧地；坚固地6．_____________n．容器→___________v．包含；容纳；装盛7．_______________n．限制，约束→____________v．限制→_______________adj.有限的8．___________n．流利，流畅→__________adj.流利的→____________adv.流利地conflictconflictingtighttightlycontainercontainrestrictionrestrictrestrictedfluencyfluentfluently返回目录9．_________vt.&vi.剃；刮n．刮脸，刮胡子，修面→__________n．剃须刀10．__________n．恳求；呼吁vi.(对某人)有吸引力→_____________adj.有吸引力的，有趣的11．____________n．植物学家→__________n．植物学→_____________adj.植物学的12．__________vt.&vi.发展；进展；进化→_____________n．演变；进化→________________n．进化论；进化说shaveshaverappealappealingbotanistbotanybotanicalevolveevolutionevolutionism返回目录13．___________adj.典型的，有代表性的→______________n．典型性；特征→_____________adv.代表性地14．____________adj.精巧的；脆弱的；微妙的→______________adv.巧妙地；细致地15．____________adj.芬芳的；香的→_____________n．香味；芬芳typicaltypicalitytypicallydelicatedelicatelyfragrantfragrance返回目录Ⅱ.重点短语1．adapt______适应于2．dateback______追溯到；远在……年代3．set______资助；(使)开始从事某种职业；建立4．appeal______对……有吸引力；呼吁5．avastvariety______大量的，各种各样的totouptoof返回目录Ⅲ.重点句型1．However,_________________(直到……才)theeighteenthandnineteenthcenturies_______theexplorationofthebotanicalworldbeganonalargescale.2．Cookcalledthebay_________theEndeavourhadanchoredBotanybay.3．Usuallythenectarisattheendofasmall,narrowtube_________lengthisthesameasthetongueofaparticularspecies.itwasnotuntilthatwherewhose返回目录[课文理解]Ⅰ.课文大意理解1．Whendidthefirstrecordedplantexplorationhappen?A．Inthe18thcentury.B．About1,500yearsago.C．About3,500yearsago.D．About2,500yearsago.答案C返回目录2．Whatisthemostprobablereasonforcollectingnewplantsinthe18thand19thcentury?A．Newplantscouldbeusedforscientificresearch.B．Theplantcollectorstookgreatinterestintheexpeditions.C．Theplantcollectorswereeagertoenrichtheirexperiences.D．Theplantcollectorswantedtointroducenewspeciestotheirnativecountry.答案D返回目录3．WhatisaWardiancase?A．It'sacasewhichcanbecarried.B．It'sacasemadeofmetal.C．It'sacontainerwhichsuppliesfreshwatertoplants.D．It'sacasewithlittleholestoletairin.答案B返回目录4．Whydosomeplantsneedanimals?A．Theanimals'visitcanmaketheplantsgrowbetter.B．Someplantsneedanimalstopollinatethem.C．Theanimalscanhelptheplantsgetridofpests.D．Theplantswillgrowstrongeriftheyaredisturbed.答案C返回目录5．Whatistheadvantageforanimalsofvisitingflowers?A．Animalscanfeedontheflowers.B．Animalscangetenoughwaterfromtheflowers.C．Animalscangetfoodcallednectarfromtheflowers.D．Thepassagedoesn'ttellus.答案B返回目录Ⅱ.课文语法填空Theplantsinourgardenslookfamiliar,butinfactmanyofthemdateback1.______manyyearsago.Inthepast,many2._________________(civilize)sawthevalueofbringingbackplants.Somanyofthemdidit.3.___________，itwasn'tpopularuntilthe18thand19thcenturies.Atthattime,manybraveyoungmentooktheopportunity4.___________(find)newplants,suchasFatherd'Incarville,sirJosephBanks.tocivilizationsHowevertofind返回目录Butk