人教版高一英语必修四Unit2Using-language.ppt

Unit2workingtheland

Usinglanguage

Revisionofwordsandexpressions1.化学的chemical2.生产production3.细菌bacteria4.害虫；害兽pest5..营养nutrition6.矿物mineral7.发现；觉察discovery8.土壤soil9.减少reduce10.根；根源root11.浏览skim12.画底线标underline13.总结；概要summary14.评论comment

1.逐渐增强；建立buildup2.导致；造成〔后果〕leadto3.集中〔注意力、精力等〕于focuson4.使·····免受〔影响、伤害等〕；使······不含〔有害物〕keep...freefrom/of

hybridcornseedlesswatermelon

Whatdofarmersputintothesoilto

makecropsgrow?It’sfertilizer.

Therearetwokindsoffertilizers.naturalfertilizerschemicalfertilizers

ReadingChemicalorOrganicFarming

Skimming1.Whatisorganicfarming?Organicfarmingissimplyfarmingwithoutusinganychemicals.Thegoalistogrowgoodfoodandavoiddamagingtheenvirnmentorpeople’shealth.2.Whatisthegoalofusingorganicfarmingmethods?

Scanning(Matcheachparagraphanditsmainidea)P.1Othermethodstokeepthesoilfertile.P.2Farmersandcustomersturntoorganicfarming.P.3Problemscausedbychemicalfertilizers.P.4Long-termuseofchemicalfertilizerscancausedamagetothelandandpeople’shealth.

What’smainideaofthepassage?Useonesentencetodiscribeit.Ittalksaboutchemicalfarmingcancausemanyproblems,soorganicfarmingisbecomingmorepopular.

Choosethebestanswer1.Chemicalfertilizershasbecomeverycommoninfarming.WhichfollowingreasonisWRONG?()A.Chemicalfertilizerscanstopcropdiseas