Unit 5 Using language 2 （ppt课件）-2022新人教版（2019）《高中英语》选择性必修第一册.pptx

1、Miss LinChemical化学耕种 Organic有机耕种Chemical Versus Organic Farming vss What can be used to make plants grow better?Fertilizer.Different kinds of fertilizers,which one will you choose:Natural waste from animalsChemical fertilizers They are _pestsTo protect the crops,farmers have to kill off the harmful

2、pests.What is used for killing pests,especially insects?pesticidesRecycling of fertilizer肥料的循环种植动植物吸收土壤、水源施肥If too much fertilizer is used,what harm will it do to the human body?Organic FarmingOrganic farming is simply farming without using any chemicals.Which tomatoes do you prefer?5 yuan/kg30 yuan

3、/kgNormal tomatoesOrganic tomatoesChemical Versus Organic Farming 1、When did the chemical pesticides and artificial fertilizers have been in widespread use?2、Why did many farmers welcome the introduction of chemical farming?3.What concerns many people about the use of pesticides?What some scientists

4、 have found is that their long-term use can sometimes harm both the land and peoples health.翻译翻译一些科学家发现，一些科学家发现，长期使用它们有长期使用它们有时会危害土地和时会危害土地和人类健康。人类健康。Whats the disadvantages of using pesticides?What is one problem with the use of chemical fertilisers?1.How is organic farming different from chemical

5、farming?Why do organic farmers change the kind of crop grown in a field every year?What keep people from stopping the use of man-made chemicals?What is the goal of using organic farming methods?1.What is the main idea of the text?(4 5 )A.Advantages and disadvantages of chemical farming and organic f

6、arming.B.Chemical pesticides can fight crop disease and increase production.C.Artificial fertilisers can harm both the land and peoples health.D.Organic farmers focus on keeping their soil rich and free of disease through natural means.AMatch the main ideas(A-D)below with the paragraphs.A What organ

7、ic farming is B Why man-made chemicals are still used in farming C Organic methods for producing rich soilD The problems with chemical farmingPara.1-2Para.3Para.4Para.5DACBP56 Complete the sentences in the tables.Para.Main IdeaDetail 1-2 Pesticides can kill helpful _Some pesticides have been _ becau

8、se of the _Crops grown with chemical fertilisers usually _ to be full of _.bacteria and insects prohibiteddamage they causegrow too fast nutritionDPara.Main IdeaDetail 3Many organic farmers use _ _ as fertiliser.4 They often _ grown in each field _.They also plant crops that use _ of the soil to hel

9、p keep it rich.5 Organic farming is nowhere near able to meet the high _.from animals change the kind of crop every year different depths demand for food around the world natural wasteACBWriting Try to recite the following sentences for writing.（1）For example,pesticides can damage the land by killin

10、g not only harmful bacteria and insects,but also helpful ones.（2）As an alternative,some farmers have switched to organic farming,and many customers have turned to organic food when they shop at the local grocery.（3）Organic farmers focus on keeping their soil rich and free of disease through natural

11、means.（4）Why different crops are grown is because they put important minerals back into the ground,making it ready for the next batch of crops.（5）Some people would prefer to stop the use of man-made chemicals in agriculture entirely.P57、Decide whether your group supports chemical farming or organic

12、farming.Come up with three main points to support your opinion,and then add at least one detail to support each main point,complete the outline below.Use your outline to write a short essay giving your opinion on the topic.假如你是李华，你班就化学农业和有机农业进行了讨论，请你写一篇文章阐述一下你的观点。内容如下：1.有机农产品不含化学农药；2.有机农业可以改善土壤条件；3.

13、有机农业让农民增加收入。注意：词数80左右。参考词汇：喷洒化学农药 spray chemical pesticides Recently our class has had a debate about whether organic farming is preferable to chemical farming.Im in favour of organic farming.Here are some reasons.Firstly,farmers are forbidden to spray chemical pesticides on the plants in organic fa

14、rming.Secondly,farmers use natural waste from animals as fertiliser,which will be good for improving the conditions of the soil.Thirdly,organic farming can increase the farmers income.With more and more people caring about their health,they tend to buy organic fruits and vegetables.I hope more and more farmers will turn to organic farming in the future.Finish your essay and revise it based on the feedback.