高中英语必修4unit2：Using-language(共20张)课件.pptx--（课件中不含音视频）

1、 Unit 2 Working the land Using languageReadingCHEMICAL OR ORGANIC FARMING?Add fertilizer into the soil How can farmers make the plants grow well?How many kinds of fertilizers do farmers use?natural fertilizerorganic farmingchemical fertilizerchemical farmingTwo kinds.Discussion:Which kind of farming

2、 is better?Betterchemical fertilizer cow dung用化学肥料和有机肥料的区别用化学肥料和有机肥料的区别:ORGANIC FARMING Organic farming is simply farming without using any chemicals.Lets learn more about chemical and organic farming!The main idea of each paragraphpay attention to the first and the last sentence of each paragraphLo

3、ng-term use of chemical fertilizers can cause damage to the land and peoples health.Problems caused by chemical fertilizers.The main idea of each paragraphP1.P2.Farmers and customers turn to organic farming.Other methods to keep the soil fertile.P3.P4.1.Why are chemical fertilizers so popular in far

4、ming today?A.Because they are cheap.B.They are a good way to stop crop disease and increase production.C.They can cause damage to the land.D.They do good to peoples health.Paragraph IChemical farming advantages problems cause stop crop diseaseincreaseproductiondamage thelandby killing the helpful ba

5、cteria and pests as well as the harmful ones.affect crops-animals and humansby staying in the ground and underground water for a long timelead to cancer/illnessesby building up in peoples bodies over timehave lessnutritionby growing too fastParagraph 2 No use of chemical fertilizers Keep soil rich i

6、n mineralsand free of disease helps crops grow strong and healthy Keep the air,soil,water and crops free from chemicalsadvantages of organic farming:Paragraph 31.What is“organic farming”?Answer the questions.It refers to crops growing with natural rather than chemical fertilizers.2.What do organic f

7、armers prefer to use as fertilizer?Natural waste from animals.Organic farming methods advantagesuse natural wastemake the soil richin mineralschange the kind of cropput minerals back into soil,makingplant crops with different levels of soilsuse different levels of land plant grass between cropspreve

8、ntfrom,a natural fertilizerParagraph 4 Find and write down the methods and advantages in the passage.What is the main goal for using organic farming methods?To grow good food and to avoid damaging The environment or peoples health.1.Which statement is WRONG according to the text?A.All crops are orga

9、nic.B.Recently,the term“organic farming”has gained another meaning.C.All farmers use fertilizers.D.Scientists believe some chemical fertilizers are better for people.Read again and choose the best answer.D2.Which is not the reason why organic farmers prefer natural waste from animals?A.It can keep t

10、he food free from chemicals.B.It can keep the air,soil and water free from chemicals.C.It can kill harmful pests.D.It can make the soil richer in mineral.C3.What is the advantage of using chemical fertilizers?A.Leaving chemicals in the ground for a long time is good for water supply.B.They can get t

11、he soil exhausted.C.They can kill helpful bacteria.D.They can kill harmful pest.D 4.The organic farmers do the followings except _.A.adding chemicals fertilizers which is rich in mineralB.changing crops every two or three yearsC.planting seeds in different layers of the soilD.planting grass between crops to prevent the soil from being blown awayA