chemical-or-organic-farming-公开课课件.ppt

1、Chemical Or Organic Farming?,green food,organic food,1. Have you ever been to the countryside? 2. Do you know how to work on a farm?,Step 1: warming up,Lets go to the farm!,First, buy or select the seeds from the store.,Second, we need to plough or turn over the soil.,Third , we sow the seeds in the

2、 soil.,Finally, we can harvest our grain/sorghum/peanuts .,In order to improve the output of the crop, we need to rid the soil of the weed, water the crop, fertilize the soil and kill off the pest.,water the crop,rid the soil of the weed,fertilize the soil,kill off the pest,to improve the output of

3、the crop,fertilizer,How many kinds of fertilizers do farmers use? There are two kinds. They are chemical fertilizers and natural ones.,chemical fertilizers natural fertilizers,Which kind do farmers use when they are doing organic farming? Do you know about organic farming?,Reading Chemical or Organi

4、c Farming,1).化肥 2)细菌 3).对造成损害 4).洗掉某物 5).导致;造成(后果);通往 6).逐渐增强,堆积，建立 7).另外(还有) 8).使免受(影响); 使不含(有害物) 9).集中(注意力、精力)于 10).每隔几年 11).避免做,fertilizer bacteria cause/do damage to wash off lead to build up in addition keepfree from/of focus on every few years avoid doing,First reading: get the main idea of ea

5、ch paragraph. para1:Long-term use of fertilizers can cause damage to the land and people s health para2: The problem caused by chemical fertilizers para3: The advantages of using organic farming. para4: Some methods to keep the soil fertile.,1 Why are chemical fertilizers so popular in farming today

6、? 2 After the long-term use of chemical fertilizers, what have scientists found?,Many farmers welcomed them as a great way to stop crop disease and increase production. Long-term use of chemical fertilizers can cause damage to the land and , even more dangerous, to peoples health.,Recently, however,

7、therefore; meanwhile; anyhow; thus ;otherwise; moreover; besides etc.,Second reading,Read paragraph 2 and find out the problems caused by using chemical fertilizers.,There are three problems.First, they can damage as well as . They also stay in the and . In addition, grow too fast to .,first;second;

8、 finally;last but not least ,etc.,Read paragraph 3-4,What are the advantages of organic farming? The farmers focus on keeping their soil rich and free of disease and keeping the air , soil, water and crops free from chemicals.,Tips: several phrases can be used.,The methods to keep the soil fertile 1

9、 using natural waste from animals as fertilizer. 2 changing the kind of crop in each field . 3 planting crops to use different levels of soil 4 planting grass between crops to prevent ,The same goal : _ _ _,to grow good food and to avoid damaging the environment or peoples health.,Language points,1.

10、 These chemicals in the food supply build up in peoples bodies over time. build up 增强; 建立；开发 Hard working conditions build up character. 艰苦的工作条件能磨练人的性格。 He built up his strength again after an illness. 他病后逐步恢复体力。,2. Many of these chemicals can lead to cancer or other illnesses. lead to: 导致；造成(后果） To

11、o much work and too little rest often lead to illness. 过量的工作和过少的休息会引起疾病。 All roads lead to Rome. 条条大道通罗马。,通往,即学即练 用lead to的适当形式完成句子。 1. Students should always remember that hard work is the main way which _ success. 2. The bad weather _ a terrible accident a few days ago.,leads to,led to,联想 result i

12、n引起(某种结果)、使获得(某种成果)、结果。如： The accident resulted in two deaths. result from由造成、因而产生。如： Sickness sometimes results from eating too much.,含介词to的东侧短语： come to 来到，苏醒 refer to 参考， 涉及 look forward to 盼望 pay attention to 注意,stick to 坚持 devote to 致力于 turn to get close to 靠近,3. They focus on keeping their soi

13、l rich and free of disease. focus on:集中(注意力，精力等）于 Focus on life. focus ones attention on 集中注意力于 focus ones mind on 把心思集中到上 You should focus your attention on your work. 你应该把注意力集中在你的工作上。 EW他需要更集中于他的事业。 He needs to focus more on his career.,瞄准生活。,4. reduce vt. 减少，减缩,They have to reduce expenses this y

14、ear. 他们今年必须削减开支。 搭配 reduce to 减到，降到 reduce by 减了， 降了 Please reduce_ 2% off the invoice price. The water will freeze when the thermograph reduces _ zero centigrade.,by,to,5. This also keeps the air, soil, water and crops free from chemicals.,这样还可以让空气、土壤、水以及农作物不受化学物质的污染。,keep free from/of使免受(影响/伤害等) 锻

15、炼能使我们摆脱疾病。 Exercise can keep us free from disease. 联合国正试图使世界免受战争的威胁。 The United Nation is trying to keep the world free from the threat of war.,6. Crops such as peas or soybeans put important minerals back into the soil, making it ready for crops such as wheat or corn that need rich and fertile soil

16、.,分析 本句结构比较复杂。其主干结构为: 主句(Crops put important minerals back into the soil) + 状语(making it ready for crops)。 状语中又包含“make + it + 形容词”结构和由that引导的定语从句(that need rich and fertile soil)。,7. Some organic farmers prefer planting grass between crops to prevent wind or water from carrying away the soil, and th

17、en leaving it in the ground to become a natural fertilizer for the next years crop. 分析 本句的主干结构是一个简单句, 其结构是: 主语(farmers) + 谓语(prefer) + 并列宾语(planting . + leaving .)。,其中between crops和in the ground作地点状语。 两个宾语后面又分别带有一个不定式作目的状语（to prevent wind or water from carrying away the soil和to become a natural fert

18、ilizer for the next years crop）。,para1: A new discovery of scientists. para2: Several problems caused by using chemical fertilizers. para3: The advantages of using organic farming. para4: Some methods to keep the soil fertile.,The structure of this passage,Para1 Topic,Para2 Problems,Para3 Advantages

19、,Para4 Several methods,illustration（阐明） comparison conclusion,The type of the article is_,exposition（说明文）,First reading: get the main idea of each paragraph. para1:Long-term use of fertilizers can cause damage to the land and people s health para2: The problem caused by chemical fertilizers para3: T

20、he advantages of using organic farming. para4: Some methods to keep the soil fertile.,1 Why are chemical fertilizers so popular in farming today? 2 After the long-term use of chemical fertilizers, what have scientists found?,Many farmers welcomed them as a great way to stop crop disease and increase

21、 production. Long-term use of chemical fertilizers can cause damage to the land and , even more dangerous, to peoples health.,Recently, however,therefore; meanwhile; anyhow; thus ;otherwise; moreover; besides etc.,Second reading,Read paragraph 2 and find out the problems caused by using chemical fer

22、tilizers.,There are three problems.First, they can damage as well as . They also stay in the and . In addition, grow too fast to .,first;second; finally;last but not least ,etc.,Read paragraph 3-4,What are the advantages of organic farming? The farmers focus on keeping their soil rich and free of di

23、sease and keeping the air , soil, water and crops free from chemicals.,Tips: several phrases can be used.,The methods to keep the soil fertile 1 using natural waste from animals as fertilizer. 2 changing the kind of crop in each field . 3 planting crops to use different levels of soil 4 planting gra

24、ss between crops to prevent ,The same goal : _ _ _,to grow good food and to avoid damaging the environment or peoples health.,Language points,1. These chemicals in the food supply build up in peoples bodies over time. build up 增强; 建立；开发 Hard working conditions build up character. 艰苦的工作条件能磨练人的性格。 He

25、built up his strength again after an illness. 他病后逐步恢复体力。,2. Many of these chemicals can lead to cancer or other illnesses. lead to: 导致；造成(后果） Too much work and too little rest often lead to illness. 过量的工作和过少的休息会引起疾病。 All roads lead to Rome. 条条大道通罗马。,通往,即学即练 用lead to的适当形式完成句子。 1. Students should alwa

26、ys remember that hard work is the main way which _ success. 2. The bad weather _ a terrible accident a few days ago.,leads to,led to,联想 result in引起(某种结果)、使获得(某种成果)、结果。如： The accident resulted in two deaths. result from由造成、因而产生。如： Sickness sometimes results from eating too much.,含介词to的东侧短语： come to 来

27、到，苏醒 refer to 参考， 涉及 look forward to 盼望 pay attention to 注意,stick to 坚持 devote to 致力于 turn to get close to 靠近,3. They focus on keeping their soil rich and free of disease. focus on:集中(注意力，精力等）于 Focus on life. focus ones attention on 集中注意力于 focus ones mind on 把心思集中到上 You should focus your attention o

28、n your work. 你应该把注意力集中在你的工作上。 EW他需要更集中于他的事业。 He needs to focus more on his career.,瞄准生活。,4. reduce vt. 减少，减缩,They have to reduce expenses this year. 他们今年必须削减开支。 搭配 reduce to 减到，降到 reduce by 减了， 降了 Please reduce_ 2% off the invoice price. The water will freeze when the thermograph reduces _ zero cent

29、igrade.,by,to,5. This also keeps the air, soil, water and crops free from chemicals.,这样还可以让空气、土壤、水以及农作物不受化学物质的污染。,keep free from/of使免受(影响/伤害等) 锻炼能使我们摆脱疾病。 Exercise can keep us free from disease. 联合国正试图使世界免受战争的威胁。 The United Nation is trying to keep the world free from the threat of war.,6. Crops suc

30、h as peas or soybeans put important minerals back into the soil, making it ready for crops such as wheat or corn that need rich and fertile soil.,分析 本句结构比较复杂。其主干结构为: 主句(Crops put important minerals back into the soil) + 状语(making it ready for crops)。 状语中又包含“make + it + 形容词”结构和由that引导的定语从句(that need

31、rich and fertile soil)。,7. Some organic farmers prefer planting grass between crops to prevent wind or water from carrying away the soil, and then leaving it in the ground to become a natural fertilizer for the next years crop. 分析 本句的主干结构是一个简单句, 其结构是: 主语(farmers) + 谓语(prefer) + 并列宾语(planting . + lea

32、ving .)。,其中between crops和in the ground作地点状语。 两个宾语后面又分别带有一个不定式作目的状语（to prevent wind or water from carrying away the soil和to become a natural fertilizer for the next years crop）。,para1: A new discovery of scientists. para2: Several problems caused by using chemical fertilizers. para3: The advantages o

33、f using organic farming. para4: Some methods to keep the soil fertile.,The structure of this passage,Para1 Topic,Para2 Problems,Para3 Advantages,Para4 Several methods,illustration（阐明） comparison conclusion,The type of the article is_,exposition（说明文）,1 Why are chemical fertilizers so popular in farmi

34、ng today? 2 After the long-term use of chemical fertilizers, what have scientists found?,Many farmers welcomed them as a great way to stop crop disease and increase production. Long-term use of chemical fertilizers can cause damage to the land and , even more dangerous, to peoples health.,Recently,

35、however,therefore; meanwhile; anyhow; thus ;otherwise; moreover; besides etc.,Second reading,Read paragraph 2 and find out the problems caused by using chemical fertilizers.,There are three problems.First, they can damage as well as . They also stay in the and . In addition, grow too fast to .,first

36、;second; finally;last but not least ,etc.,Read paragraph 3-4,What are the advantages of organic farming? The farmers focus on keeping their soil rich and free of disease and keeping the air , soil, water and crops free from chemicals.,Tips: several phrases can be used.,The methods to keep the soil f

37、ertile 1 using natural waste from animals as fertilizer. 2 changing the kind of crop in each field . 3 planting crops to use different levels of soil 4 planting grass between crops to prevent ,The same goal : _ _ _,to grow good food and to avoid damaging the environment or peoples health.,para1: A n

38、ew discovery of scientists. para2: Several problems caused by using chemical fertilizers. para3: The advantages of using organic farming. para4: Some methods to keep the soil fertile.,The structure of this passage,Para1 Topic,Para2 Problems,Para3 Advantages,Para4 Several methods,illustration（阐明） com

39、parison conclusion,The type of the article is_,exposition（说明文）,Language points,1. These chemicals in the food supply build up in peoples bodies over time. build up 增强; 建立；开发 Hard working conditions build up character. 艰苦的工作条件能磨练人的性格。 He built up his strength again after an illness. 他病后逐步恢复体力。,2. Man

40、y of these chemicals can lead to cancer or other illnesses. lead to: 导致；造成(后果） Too much work and too little rest often lead to illness. 过量的工作和过少的休息会引起疾病。 All roads lead to Rome. 条条大道通罗马。,通往,即学即练 用lead to的适当形式完成句子。 1. Students should always remember that hard work is the main way which _ success. 2.

41、The bad weather _ a terrible accident a few days ago.,leads to,led to,联想 result in引起(某种结果)、使获得(某种成果)、结果。如： The accident resulted in two deaths. result from由造成、因而产生。如： Sickness sometimes results from eating too much.,含介词to的东侧短语： come to 来到，苏醒 refer to 参考， 涉及 look forward to 盼望 pay attention to 注意,sti

42、ck to 坚持 devote to 致力于 turn to get close to 靠近,3. They focus on keeping their soil rich and free of disease. focus on:集中(注意力，精力等）于 Focus on life. focus ones attention on 集中注意力于 focus ones mind on 把心思集中到上 You should focus your attention on your work. 你应该把注意力集中在你的工作上。 EW他需要更集中于他的事业。 He needs to focus

43、more on his career.,瞄准生活。,4. reduce vt. 减少，减缩,They have to reduce expenses this year. 他们今年必须削减开支。 搭配 reduce to 减到，降到 reduce by 减了， 降了 Please reduce_ 2% off the invoice price. The water will freeze when the thermograph reduces _ zero centigrade.,by,to,5. This also keeps the air, soil, water and crops

44、 free from chemicals.,这样还可以让空气、土壤、水以及农作物不受化学物质的污染。,keep free from/of使免受(影响/伤害等) 锻炼能使我们摆脱疾病。 Exercise can keep us free from disease. 联合国正试图使世界免受战争的威胁。 The United Nation is trying to keep the world free from the threat of war.,6. Crops such as peas or soybeans put important minerals back into the soil

45、, making it ready for crops such as wheat or corn that need rich and fertile soil.,分析 本句结构比较复杂。其主干结构为: 主句(Crops put important minerals back into the soil) + 状语(making it ready for crops)。 状语中又包含“make + it + 形容词”结构和由that引导的定语从句(that need rich and fertile soil)。,7. Some organic farmers prefer planting

46、 grass between crops to prevent wind or water from carrying away the soil, and then leaving it in the ground to become a natural fertilizer for the next years crop. 分析 本句的主干结构是一个简单句, 其结构是: 主语(farmers) + 谓语(prefer) + 并列宾语(planting . + leaving .)。,其中between crops和in the ground作地点状语。 两个宾语后面又分别带有一个不定式作目

47、的状语（to prevent wind or water from carrying away the soil和to become a natural fertilizer for the next years crop）。,请以“PLASTIC OR CLOTH BAGS?”为题模仿这篇文章的篇章结构和句子结构去写一篇说明文。,垫江报社征文:绿色行动进行中征写与环保相关的英文文章. 导言：古往今来，地球妈妈用甘甜的乳汁哺育了无数代子孙。原来的她被小辈们装饰得楚楚动人。可是，现在人类为了自身的利益，将她折磨得天昏地暗。人类只有一个地球；而地球正面临着严峻的环境危机。“救救地球”已成为世界各国

48、人民最强烈的呼声。我们大家都喜欢蓝蓝的天空，清澈的湖水，新鲜的空气，渴望生活在鸟语花香里，希望我们的家园更美丽。要想实现这些我们垫江人现在就应该开始行动了。 以“Plastic or Cloth Bags?”为题写一篇说明文。(请模仿这篇文章的篇章结构和句子结构),使用塑料袋的害处有： 1.“白色污染”的主要来源； 2.不可回收再利用； 3.燃烧污染空气； 4.埋掉(200年不会溶解)污染土壤和地下水。使用环保袋的好处有： 1.可以大量减少塑料袋的使用； 2.使用寿命比纸袋长； 3.可以循环利用； 4.价格低廉，易于推广。,para1: A new discovery of scientist

49、s. para2: Several problems caused by using chemical fertilizers. para3: The advantages of using organic farming. para4: Some methods to keep the soil fertile.,The structure of this passage,Para1 Topic,Para2 Problems,Para3 Advantages,Para4 Several methods,illustration（阐明） comparison conclusion,The type of the article is_,exposition（说明文）,para1: A new discovery of scientists. para2: Several problems caused by using chemical fertilizers. para3: The advantages of using organic farming. para4: Some methods to keep the soil fertile.,The structure of this passage,Para1 Topic,Para2 Problems,Para3 Adv