高中英语新课标必修四第二单元reading2.ppt

高中英语新课标必修四第二单元reading2.ppt

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ChemicalOrOrganicFarming?

fertilizerWhatdofarmersputintothesoiltomakecropsgrowwell?

naturalfertilizer（animalwaste）chemicalfertilizerWordsandespressionsp1.chemicalfertilizers化肥化肥increaseproduction增加产量增加产量Long-termuseof长期使用长期使用causedamageto对对造成伤害造成伤害P2.stayintheground呆在土壤里呆在土壤里washoff洗掉洗掉leadto导致导致buildup增强增强inaddition另外另外befullofnutrition充满营养充满营养P3.organicfarming有机耕作有机耕作turnto转向转向focusonsth./doingsth.集集中注意力于中注意力于reducedisease减少病害减少病害keepfreefrom使使免于免于P4.everyfewyears每隔几年每隔几年putbackinto把把带到带到preventfromsth./doingsth.阻止阻止干干.naturalfertilizer天然肥料天然肥料FastreadingPara1.Para2.Para3.Para4.Long-termuseof_fertilizerscancausedamageto_.Skimthetext,trytogetthemainideaofeachparagraphTask1Farmersandcustomersturnto_._causedbychemicalfertilizers.Othermethodstokeep_chemicalthelandandpeopleshealthProblemsorganicfarmingthesoilfertile.CarefulreadingReadPart1,trytofindtheproblemsandcausesofchemicalfarming,thenfilltheblanks.TaskoneProblemsCausesChemicalfarmingdamage_affect_,_and_.leadto_and_.fruit,vegetablesandotherfoodhaveless_.bykilling__bystayinginthegroundandundergroundwaterbybuildingup__bygrowingtoofastthelandcropsanimalshumanscancerotherillnessnutritionthehelpfulbacteriaandpestsaswellasharmfulones.inpeoplesbodiesovertimeReadPart2,trytofindtheadvantagesofnaturalfertilizersthenfilltheblanks.TasktwoOrganicfarmingNaturalfertilizersmakethesoil__Reduces（）andhelpscrops（）Keeps（）freefromchemicalsAdvantagesricherinmineralsandsomorefertileReadPart3,trytofindthemethodsandadvantagesoforganicfarming,thenfilltheblanks.TaskthreeOrganicfarmingMethodsusenaturalwaste__makethesoil__change__put_backinto_,making__plantdifferent_withdifferentlengthsof_Usedifferentlevelsofsoilplant_andthenleaveit__preventwindorwaterfromcarryingawaythesoilandbecomeanaturalfertilizerAdvantagesricherinmineralsandsomorefertilefromanimalsasfertilizerthekindofcropineachfieldeveryfewyearsimportantmineralsthesoilitreadyforothercropscropsrootsgrassbetweencropsinthegroundReadthetextagain,thenchoosethebestanswerforthefollowingquestions.Taskthree1.WhichisNOTthereasonwhyorganicfarmersprefernaturalwastefromanimals?

A.Itcankeepthefoodfreefromchemicals.B.Itcankeeptheair,soilandwaterfreefromchemicals.C.Itcankillharmfulpests.D.Itcanmakethesoilricherinmineral.2.Whatistheadvantageofusingchemicalfertilizers?

A.Leavingchemicalsinthegroundforalongtimeisgoodforwatersupply.B.Theycangetthesoilexhausted.C.Theycankillhelpfulbacteria.D.Theycankillharmfulpest.3.Theorganicfarmersdothefollowingsexcept_.A.addingfertilizerswhichisrichinmineralB.changingcropseverytwoorthreeyearsC.plantingseedsindifferentlayersofthesoilD.plantinggrassbetweencropstopreventthesoilfrombeingblownawayHomework:

Finishthewriting.