高中英语必修四-unit2-chemical-or-organic-farming-？.ppt

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1、ChemicalOrOrganicFarming?Unit2WorkingthelandWordspreviewchemicalproductionbacteriapestnutritionmineraldiscoveryadj.化学的;关于化学的n.生产;制造n.细菌n.害虫;害兽;害鸟n.营养;滋养;食物n.矿物;矿石n.发现;发觉Step1focussoilreducerootskimunderlinesummarycommentn.焦点;中心点vt.集中;聚焦n.土壤vt.减少;减缩n.根;根源vt.浏览;略读vt.画底线标出;强调n.总结;摘要

2、;概要n.评论;议论vi.&vt.表达意见;做出评论Expressionspreviewbuildupleadtofocusonkeep…freefrom/ofinaddition(to)逐渐增强;建立;开发导致;造成(后果)集中(注意力,精力等)于使……免受(影响,伤害等)；使……不含(有害物)此外1.Thegovernmenthasbanned(禁止)theuseof________weapons（武器）.chemical2.Theyhaveworkedoutaseriesof_________planstoincreaseagriculturalo

3、utputthisyear.production3.Radium(镭)isoneofthegreatest_________duringthenineteenthcentury.discoveries4.Healways_______hismindonhislessons.focuses5.Thegovernmentshouldtakemeasuresto_______envrionmentpolution.reduceStep2Fillintheblanksusingthewordsandexpressionsabove.6.Readthepassag

4、eand________thetopicofeachparagraph.underline7.You’dbetternot________untillyouknowthefacts.comment8.Wemustdoexerciseseverydayto_______ourbodies.buildup9.Misunderstandingsbetweenfriendsmay_______quarrels.leadto10.Thestudentsshould_____themselves________badhabits.keepfreefromChemic

5、alOrOrganicFarming?Step3Skimtofindthetopicsentenceormainideaforeachparagraph.Long-termuseofchemicalfertilizerscancausedamagetothelandandpeople’shealth.ProblemscausedbychemicalfertilizersFarmersandcustomersturntoorganicfarming.Othermethodstokeepthesoilfertile.Para1Para2Para3para4P

6、art1Part2chemicalfarmingorganicfarmingStructure:1.Whyarechemicalfertilizerssopopularinfarmingtoday?Long-termuseofchemicalfertilizerscancausedamagetothelandand,evenmoredangerous,topeople’shealth.ReadPara1andanswerthefollowingquestions.2.Afterthelong-termuseofchemicalfertilizers,wh

7、athavescientistsfound?Manyfarmerswelcomedthemasagreatwaytostopcropdiseaseandincreaseproduction.Chemicalfarmingproblemscause1.________thelandby______thehelpful________andpests_________harmfulones2._______crops,animalsandhumansby_______inthegroundandundergroundwater3._______cancero

8、rotherillnessesby__________inpeople’sbod