人教版高中英语必修四unit2 using language 优质课课件

人教版高中英语必修四unit2_Using_language_优质课课件
第一页,共19页。
Unit2
Workingtheland
第二页,共19页。
greenfood
organicfood
第三页,共19页。
ChemicalOrOrganicFarming?
Reading
第四页,共19页。
Recently,however,scientisthavebeen
findingthatlong-termuofthe
chemicalfertilizerscancaudamage
tothelandand,evenmoredangerous,
topeople’shealth.
Whataresomeoftheproblemscaud
bychemicalfertilizers?
Findoutandunderlinethetopicntences
ofeachparagraph.
Para1.
Para2.
Skimming
第五页,共19页。
Para3.
Para4.
Withthediscoveries,somefarmers
andmanycustomersarebeginningto
turntoorganicfarming.
Organicfarmersalsoumanyothermethodstokeepthesoilfertile.
第六页,共19页。
Scanning
Readthepassage,andanswerthequestions.
1.Howmanyproblemscanbecaudbyusingchemicalfertilizers?
2.Whataretheadvantagesoforganicfarming?
3.Whichoneisn'tthemethodtokeepthesoilfertile?
第七页,共19页。
1.Howmanyproblemscanbecaudbyusingchemicalfertilizers?
First,theycandamage…aswellas….Chemicalsalsostayinthe…and….Inaddition,…growtoofastto….
Therearethreeproblems.
第八页,共19页。
2.Whataretheadvantagesoforganicfarming?
Thefarmers_______keepingtheirsoilrichandfreeofdiaand_______theair,soil,waterandcrops_________chemicals.
focuson
keeping
freefrom
第九页,共19页。
3.Whichoneisn'tthemethodtokeepthesoilfertile?
A.usingnaturalwastefromanimalsasfertilizer.
B.changingthekindofcropineachfield.
C.plantingcropstouthesamelevelofsoil.
D.plantinggrassbetweencropstopreventwindorwaterfromcarryingawaythesoil.
第十页,共19页。