高中英语 Unit 2 Working the land Period 4 Using Language课件 新人教必修4

1、2021/8/11 星期三1 Unit 2 Working the land Using language2021/8/11 星期三2231.Master the following new words, phrases and sentences in using languageproduction, bacteria, pest , nutrition, discovery, soil, rootregret, reduce, regretbuild up, keepfree from, lead to, focus on, in additionSome organic farmers

2、 prefer planting grass between crops to prevent wind or water from carrying away the soil2. Learn the advantages of organic farming.2021/8/11 星期三3 本课首先观看嘉世有机农业视频，引出本节题目“化学耕作还是农业耕作”。进而讨论化学耕作和有机耕作的概念。化学耕作的弊端是什么？为什么农民转而开始有机耕作？有机耕作通过什么方法来保持土地的肥沃？然后让学生听课文录音，了解短文的主旨以及各段的大意。最后讲解短文的语言点。最后通过改写的短文加深对本文的了解。 讲解

3、农业耕作是配有相关的视频，有助于学生理解。总结概括文章和段落大意，提高学生的理解和表达能力。听课文录音有助于学生听力水平的提高。2021/8/11 星期三4ReadingCHEMICAL OR ORGANIC FARMING?2021/8/11 星期三5What can we harvest? No pains, no gains.2021/8/11 星期三6Add fertilizer into the soil How can farmers make the plants grow well?2021/8/11 星期三7How many kinds of fertilizers do f

4、armers use? natural fertilizerorganic farmingchemical fertilizerchemical farmingTwo kinds. Discussion: Which kind of farming is better?Better2021/8/11 星期三8Lets learn more about chemical and organic farming! Listen to the tape carefully.2021/8/11 星期三9organic farming is becoming more popular. The main

5、 idea of the text:Fast Reading2021/8/11 星期三10Long-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.

6、2021/8/11 星期三11Careful ReadingWhy are chemical fertilizers so popular in farming today?Because they are cheap.They are a good way to stop crop disease and increase production.They can cause damage to the land.They do good to peoples health.Paragraph I2021/8/11 星期三12Chemical farming advantages proble

7、ms cause stop crop disease increase productiondamage thelandby killing the helpful bacteria and pests as well as the harmful ones.affect cropsby staying in the ground and underground water for a long timelead to cancer/illnessesby building up in peoples bodies over timehave lessnutritionby growing t

8、oo fastParagraph 22021/8/11 星期三13Organic farming Natural waste from animalsMake the soil richer in minerals and more fertileA healthy soilReduce diseases in cropsHelp crops grow strong and healthyParagraph 32021/8/11 星期三14Organic farming methods advantagesuse natural wastemake the soil rich in miner

9、alschange the cropput minerals back into soil, makingplant crops with different rootsuse different levels of land plant grass between cropspreventfrom,a natural fertilizerParagraph 42021/8/11 星期三151. Which statement is WRONG according to the text? A. All crops are organic. B. Recently, the term “org

10、anic 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. D2021/8/11 星期三162. Which is not the reason why organic farmers prefer natural waste from animals? A. It can keep the

11、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.C2021/8/11 星期三173. What is the advantage of using chemical fertilizers? A. Leaving chemicals in the ground for a long time is good for water s

12、upply. B. They can get the soil exhausted. C. They can kill helpful bacteria. D. They can kill harmful pest. D 2021/8/11 星期三184. The organic farmers do the followings except _.A. adding fertilizers which is rich in mineralB. changing crops every two or three yearsC. planting seeds in different layer

13、s of the soilD. planting grass between crops to prevent the soil from being blown awayA 2021/8/11 星期三191. What is “organic farming”? Answer the questions.It refers to crops growing with natural rather than chemical fertilizers.2. What do organic farmers prefer to use as fertilizer? Natural waste fro

14、m animals.2021/8/11 星期三20Because peas and beans can put minerals back into the soil, making it rich and healthy and ready to grow more wheat or corn.3. Why do organic farmers grow peas or soybeans after corn or wheat?2021/8/11 星期三214. What is the main goal for using organic farming methods?To grow g

15、ood food and to avoid damaging The environment or peoples health.2021/8/11 星期三22 No use of chemical fertilizers Away from industrial areas Away from dirty water supply No air pollutionA summary of organic farming:2021/8/11 星期三23Fill in the blanksMany farmers welcome _ fertilizers because they are gr

16、eat way to stop crop disease and increase _.But these chemical can _ to illnesses. So farmers began to turn to _ farming. They _ on keeping their soilrich and _ of disease. Organic farmers often prefer using _ waste of animals as fertilizer. This keepsthe soil free _ chemicals. There are many method

17、sto keep the soil _. The methods have the same goal:to grow good food and avoid damaging the _or peoples health. chemicalproductionfocusfreenaturalfromfertileenvironmentleadorganic2021/8/11 星期三241. These chemicals in the food supply build up in peoples bodies over time.Language PointsHard working co

18、nditions build upcharacter. build up 增强; 建立; 开发 艰苦的工作条件能磨练人的性格。2021/8/11 星期三252. Many of these chemicals can lead to cancer or other illnesses.All roads lead to Rome. lead to 导致；造成条条大道通罗马。2021/8/11 星期三263. They focus on keeping their soil rich and free of disease.focus on: 集中(注意力, 精力等)于You should fo

19、cus your attention onyour work.把注意力集中在你的工作上。 2021/8/11 星期三274. This also keeps the air, soil, water and crops free from chemicals.4. You must take care to keep the wound free from the dirt. keeps free from /of: 使免受(影响, 伤害等); 使不含(有害物)你必须照顾好伤口，免受灰尘的伤害。2021/8/11 星期三285. reduce v. 减少, 降低e.g.公司尽力通过减少花销来提

20、高利润。The company tries to increase profits by_ .今年我们已经减少了业务开支。We _ expenses this year. reducing costshave reduced2021/8/11 星期三29Expressions 1. 化肥2. 对造成损害3. 洗掉某物4. 导致; 造成(后果); 通往5. 逐渐增强, 建立6. 另外(还有)7. 使免受(影响);8. 集中(注意力、精力)于9. 每隔几年10. 避免做chemical fertilizerscause/do damage towash offlead tobuild upin addition (to)keepfree from/offocus onev