完整版chemical-or-organic-farming-公开课课件.ppt

1、Chemical Or Organic Farming?green foodorganic food 1. Have you ever been to the countryside?2. Do you know how to work on a farm?Step 1: warming upLets 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 soil.Fi

2、nally, 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 croprid the soil of the weedfertilize the soilkill off the pestto improve the output of the cropfertil

3、izer How many kinds of fertilizers do farmers use?There are two kinds. They are chemical fertilizers and natural ones. chemical fertilizers natural fertilizersWhich kind do farmers use when they are doing organic farming?Do you know about organic farming? Reading Chemical or Organic Farming 1).化肥2)细

4、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fertilizerbacteriacause/do damage to wash offlead to build upin addition keepfree from/offocus on every few yearsavoid doingFirst reading: get the main idea of each paragraph.para1:Long-term use of

5、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? 2 After the long-term use of chemic

6、al fertilizers, what have scientists found?Many farmers welcomed them as agreat way to stop crop disease and increase production.Long-term use of chemical fertilizers can cause damage tothe land and , even more dangerous, to peoples health.Recently , however,therefore; meanwhile; anyhow; thus ;other

7、wise; moreover; besides etc.Second readingRead paragraph 2 and find out the problems caused by using chemical fertilizers.There are three problems.First , they can damage as well as . They alsostay in the and . In addition, grow too fast to . first;second; finally;last but not least ,etc.Read paragr

8、aph 3-4What 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 fertile1 using natural waste from animals asfertilizer. 2

9、changing the kind of crop in each field .3 planting crops to use different levels of soil4 planting grass between crops to prevent The same goal : _to grow good food and toavoid damaging the environment or peoples health.Language points1. These chemicals in the food supply build upin peoples bodies

10、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）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

11、。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 toled 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

12、。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 onlife.focus ones attention on 集中注意力于focus ones mind on 把

13、心思集中到上You should focus your attention onyour 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

14、when the thermograph reduces _ zero centigrade.byto5. This also keepsthe 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

15、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. 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

16、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 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(pref

17、er) + 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 fertilizer for the next years crop）。para1: A new discovery of scientists.para2: Several problems caused by using chemical fertilizers.p

18、ara3: The advantages of using organic farming. para4: Some methods to keep the soil fertile.The structure of this passagePara1 TopicPara2 ProblemsPara3 AdvantagesPara4 Several methodsillustration（阐明）comparison conclusionThe type of the article is_exposition（说明文）（说明文）First reading: get the main idea

19、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: The advantages of using organic farming. para4: Some methods to keep the soil fertile.1 Why are chemical fertilizers so popular in farming t

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

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

22、nally;last but not least ,etc.Read paragraph 3-4What 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 fertile1 using na

23、tural waste from animals asfertilizer. 2 changing the kind of crop in each field .3 planting crops to use different levels of soil4 planting grass between crops to prevent The same goal : _to grow good food and toavoid damaging the environment or peoples health.Language points1. These chemicals in t

24、he food supply build upin 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）Too much work and too little re

25、st 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 toled to联想 result in引起(某种结果)、使获得(某种成果)、结果。如：The accident r

26、esulted 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 onlife.focus one

27、s attention on 集中注意力于focus ones mind on 把心思集中到上You should focus your attention onyour 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 t

28、he invoice price.? The water will freeze when the thermograph reduces _ zero centigrade.byto5. This also keepsthe 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 Nati

29、on 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. 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

30、 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 then leaving it in the ground to become a natural fertilizer for the next years crop. 分析本

31、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 fertilizer for the next years crop）。para1: A new discovery of scientists.para2: Several proble

32、ms caused by using chemical fertilizers.para3: The advantages of using organic farming. para4: Some methods to keep the soil fertile.The structure of this passagePara1 TopicPara2 ProblemsPara3 AdvantagesPara4 Several methodsillustration（阐明）comparison conclusionThe type of the article is_exposition（说

33、明文）（说明文）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 agreat way to stop crop disease and increase production.Long-term use of chemical fertilizers can cause damage tothe land an

34、d , even more dangerous, to peoples health.Recently , however,therefore; meanwhile; anyhow; thus ;otherwise; moreover; besides etc.Second readingRead paragraph 2 and find out the problems caused by using chemical fertilizers.There are three problems.First , they can damage as well as . They alsostay

35、 in the and . In addition, grow too fast to . first;second; finally;last but not least ,etc.Read paragraph 3-4What 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 phra

36、ses can be used.The methods to keep the soil fertile1 using natural waste from animals asfertilizer. 2 changing the kind of crop in each field .3 planting crops to use different levels of soil4 planting grass between crops to prevent The same goal : _to grow good food and toavoid damaging the enviro

37、nment or peoples health.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 passagePara1 TopicPara2 ProblemsPara3 AdvantagesPara4 Several m

38、ethodsillustration（阐明）comparison conclusionThe type of the article is_exposition（说明文）（说明文）Language points1. These chemicals in the food supply build upin 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 illn

39、ess.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 always remember that hard work is the main way which _

40、success.2. The bad weather _ a terrible accident a few days ago.leads toled 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stick to 坚持devote to 致力

41、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 onlife.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 onyour 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

42、 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.byto5. This also keepsthe air, soil, water and crops free from chemicals.这样还可以让空气、土壤

43、、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, making it ready for crops such as wh

44、eat 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 grass between crops to prevent wind or

45、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的状语（to prevent wind or water from carrying

46、away the soil和to become a natural fertilizer for the next years crop）。请以请以“PLASTIC OR CLOTH BAGS?” 为题为题模模仿仿这篇文章的篇章结构这篇文章的篇章结构和句子结构去写一篇说和句子结构去写一篇说明文。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”已成为世界各国人民最强烈的呼声。我们大家都喜欢

47、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 scientists.para2: Several problem

48、s caused by using chemical fertilizers.para3: The advantages of using organic farming. para4: Some methods to keep the soil fertile.The structure of this passagePara1 TopicPara2 ProblemsPara3 AdvantagesPara4 Several methodsillustration（阐明）comparison conclusionThe type of the article is_exposition（说明

49、文）（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 passagePara1 TopicPara2 ProblemsPara3 AdvantagesPara4 Several methodsillustratio

50、n（阐明）comparison conclusionThe type of the article is_exposition（说明文）（说明文）Discussion and practicePlastic Or Cloth Bags?illustration（阐明）（阐明）comparison conclusionPara1:Para2:Para3:Para4:Have a brief illustration of the present situation.The problems caused by using plastic bags.The advanages of using c