高一英语课件：Unit 19 Reading and language points.ppt

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1、Unit19ModernAgriculture145671Prereading283Agriculture:TraditionalfarmingModernfarmingHi-techfarmingInthefirstpicture:Achicken/Ahen.Inthesecondpicture:Afarmerfeedingchickens.Inthethirdpicture:Amodernchickenfarm.Whatarethedifferences?Comparetheoldandthemodernwaysofr

2、aisingchickens.OldwayModernwayAfarmercanonlykeepafewchickens.Afactorycankeepthou-sandsofchickens.Itcostonlyalittlemoney.Itcostalottostartafactory.don’thavemanyproblemsifill,manydieorarekilledTheeggsandmeataretasty.Theydon’ttastesodelicious.Thechickensarefree.notfr

3、ee,cansitinsmallcagesInthefirstpicture:Apileofanimalshit(manure)Inthesecondpicture:Abagofchemicalfertilizer.Whatarethedifferences?Comparetheoldandthemodernwaysoffeedingthecrops.NaturalFertilizerChemicalFertilizerItisfreeorcostverylittle.Itiseasytobeputintothefield

4、s.Itusuallyhasabadsmell.Ittakeslittleplacetostore.Itisdifficulttocarryandmove.Itisexpensivetobuy.Itneedslotsofworktobemade.Itusuallyhasnosmell.Itneedsalotofplacetostore.Itiseasytotransport.Inthefirstpicture:*Patchesoffarmfields.Inthesecondpicture:*Afarmerisploughi

5、ngthefieldwithananimal.Inthethirdpicture:*Farmersusethetractortoworktheland.Whatarethedifferences?Comparetheoldandthemodernwaysofploughingthefields.UsingAnimalsUsingMachinescheaptoownandtokeepexpensivetobuyandtouseTheyresultinpollution.Theycanbeusedindif-ferentpla

6、cesTheydon’tneedresttoooften.Theycanbefoodwhentheyareold.Theydonotpollutetheair.Theycanonlybeusedonflatanddryland.Theyneedrestnowandthen.Theycanbesoldtosteelfactorieswhenbroken.Inthefirstpicture:*Terracedfields.Inthesecondpicture:*Drybarrenfarmland.Inthethirdpictu

7、re:*Irrigatedfarmland.Inthefourthpicture:*Greenhouses.Whatarethedifferences?Comparetheoldandthemodernwaysofirrigation.NaturalClimateControlledClimateinbadweather,cropslostclimatecontrolled,lessdamageThelandscapelosesitsnaturalbeauty.Onlyarablelandcangrowcrops.Gree

8、nhousescanbebuiltalmosteverywhere.Thelandscapeismorebeautiful.Ifthereisapowerfailure,youmaylosecrops.2.WhilereadingScanning:Q1:What’sthebiggestproblemto