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高中英语Unit4ExploringplantsSectionⅠReading讲义新人教版选修9-新人教版高二选修9英语教案.doc

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Unit4Exploringplants 植物是我们生活中必不可少的一个部分，那么你知道植物的重要性吗？ Plantsformthebasicfoodstapleforalllifeforms.Theyarethemajorsourceoffoodandoxygenonearth，sincenoanimalcansupplythesenecessarycomponentswithoutplants. Therearemanydifferenttypesofcashcropsthatproducemoneyforfarmers.Oliveoilcomesfromolives，cornoilcomesfromcorn，andpeanutoilcomesfrompeanuts.Typicalagriculturalproductslikecorn，wheat，rye，andriceareallconsideredcashcrops.Coffeeplantsproducebeansthatareusedtomakecoffee；cocaplantsgiveuschocolate；vanillaplantsgrowlongthinbeansthatareusedtoproducevanillaflavoring. Plantsarealsousedinagriculturetohelpreducewindspeed.Plantingtreesinarowpreventsthewindfromblowingawaythevaluabletopsoil.Intheforest，treesactasshelterformanyorganisms. Plantsarealsoimportantfortheoverallecologyofanarea.Rootshelptostabilizesoilandpreventthesoilerosionbywaterrunoff. Plantsarealsoimportantinouratmospherebecausetheyusecarbondioxideandgiveoffoxygenwhiletheyundergophotosynthesis. Plantsarealsousedintheurbansettingtoreducenoise，produceshade，andtobeautifyanarea.Treesaddvaluetohomesandcommunities. Plantsareessentialtothebalanceofnatureandinpeople'slives.Greenplants，i.e.，thosepossessingchlorophyll(叶绿素)，producetheirownfoodandgiveoffoxygenintheprocesscalledphotosynthesis(光合作用)，inwhichwaterandcarbondioxidearecombinedbytheenergyoflight.Plantsaretheultimatesourceoffoodandmetabolicenergyfornearlyallanimals，whichcannotproducetheirownfood.Besidesfoods，plantproductsvitaltohumansincludewoodandwoodproducts，fibers，drugs，oils，latex，pigments，andresins.Coalandpetroleum(石油)arefossilsubstancesofplantorigin.Thusplantsprovidepeoplenotonlysustenancebutshelter，clothing，medicines，fuels，andtherawmaterialsfromwhichinnumerableotherproductsaremade. 两个诱思问题 1．Whatisthepurposeofthesecondparagraph? 2．Whyareplantsimportanttoouratmosphere? 【答案】1.Givesomeexamplesabouttheuseofplants. 2.Becausetheyusecarbondioxideandgiveoffoxygenwhiletheyundergophotosynthesis. SectionⅠReading(WarmingUp,Pre­reading，Reading&Comprehending) Ⅰ.根据词性及英文释义写出单词的正确形式