unit19Modernagriculturereading课件
日期：2010-05-13 05:06
Unit19ModernAgricultureModernAgricultureUnit19modernagriculturebigfarmirrigationcropmachinefarmingGMfarmerfertilizerseedbedinsectkillergreenhouselandTraditionalfarmingModernfarmingDisadvantagesAdvantagesComparetraditionalagriculturewithmodernagriculture:notsoexpensivedon’tpollutetheairrestsometimesexpensivepollutetheairdon’tneedtorestdoesnotcostalotthemeattasteverygoodkeeponlyafewpigscostsalotofmoneythemeatdonottastesogoodkeepthousandsofpigscheaphasabadsmelltakesalotofplacetostoreExpensivehasnosmelltakeslittleplacetostorenaturalfertiliserlandscapeisbeautifulweatherconditionsarenotcontrolledlandscapeisuglyexpensivetobuildandoperateweatherconditionsarecontrolleddrylandgreenhouseMatchthebesttitleforeachpartHowtodevelopnewtechniqueswithoutharmingtheenvironment2AshortintroductionofagricultureandarablelandinChina3Usingthelatesttechniquestosolvethebiggestproblem4FarmersinChinausemoretechniquestomakethelandproducemore---part3---part1--part4--part2An，
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