人教版新课标必修四第二单元warming-up-and-reading课件.ppt

《人教版新课标必修四第二单元warming-up-and-reading课件.ppt》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

1、Chemicalororganicfarming?Whatisthethingweputonthesoilwhichmakescropsgrow?Itisfertilizer.Howmanykindsoffertilizersdofarmersuse?Andwhatarethey?Therearetwokinds.Theyarechemicalfertilizersandnaturalwastefromanimals.Whichkinddofarmersusewhentheyaredoingorgan

2、icfarming?Thesecondone---naturalwastefromanimalsChemicalororganicfarming?Readthepassagequicklyandtrytofindoutthemainideaoftheeachparagraph.*Payattentiontothekeyword(s)ineachparagraph.Task1.SkimmingD.Long-termuseofchemicalfertilizerscancausedamagetothela

3、ndandpeople’shealth.C.Problemscausedbychemicalfertilizers.P1.P2.B.Farmersandcustomersturntoorganicfarming.A.Othermethodstokeepthesoilfertile.P3.P4.Mainideaoftheeachparagraph.Mainideaofthepassage________fertilizerscancausemany________,soorganicfarmingisb

4、ecomingmore________.ChemicalproblemspopularReadingPara1:Usingchemicalfertilizerscanhurtthelandandalsopeople’shealth.1.Whyarechemicalfertilizerssopopularinfarmingtoday?2.Doyouthinkitisreallyagreatway?Theyareagreatwaytostopcropdiseaseandincreaseproduction

5、.NoWhatproblemscanbecausedbyusingchemicalfertilizers?(disadvantage)Firstly,theydamagethelandbykillingthehelpfulbacteriaandpests.Secondly,Chemicals’stayinginthegroundandundergroundwaterforalongtimeaffectscropsand,therefore,animalsandhumans.Andmanyofthech

6、emicalscanleadtocancerorotherillnesses.Thirdly,fruit,vegetablesandotherfoodgrownwithchemicalfertilizersusuallygrowtoofasttobefullofmuchnutrition.Para2:Problemscausedbychemicalfertilizers1.Whatisorganicfarming?2.Whatistheadvantageofusingnaturalfertilizer

7、?Para3:Organicfarmingisbecomingmorepopularwithsomefarmersandmanycustomers1.Whatisorganicfarming?Organicfarmingissimplyfarmingwithoutusingany________.greenfoodchemicals2.Whatistheadvantageofusingnaturalfertilizer?*Reducediseasesincropsandhelpthemgrowstro

8、ngandhealthy.*Makethesoilricherinmineralsandsomorefertile.*Besides,keeptheair,soilandwateraswellasthefoodsupplyfreefromchemical.Para4:Othermethodstokeepthesoilfertile.Howmanymethodsarementionedinthisparagraph?Andwhatarethey?2.Wha