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1、chemical-or-organic-farming-公开课课件 Four short words sum up what has lifted most successful Four short words sum up what has lifted most successful individuals above the crowd: a little bit more. individuals above the crowd: a little bit more. -author -author -date-date green food organic food 1. Have
2、 you ever been to the countryside?2. Do you know how to work on a farm? Step 1: warming up 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.Finally, we can harvest our grain/sorghu
3、m/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 pest to improve the output of the crop fertilizer How many kinds of fertilizers d
4、o farmers use? There are two kinds. They are chemical fertilizers and natural ones. Which 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
5、).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 up in addition keepfree from/of focus on every few years avoid doingFirst 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
6、 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 chemical fertilizers, what have scientists found?Many farmers welcomed them as
7、 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, therefore; meanwhile; anyhow; thus ;otherwise; moreover; besides etc.Second reading Read paragraph 2 and find o
8、ut 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; finally;last but not least ,etc.Read paragraph 3-4 What are the advantages of organic farming? The farmers focu
9、s 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 as fertilizer. 2 changing the kind of crop in each field .3 planting crops to use
10、 different levels of soil4 planting grass between crops to prevent The same goal : _ to grow good food and to avoid damaging the environment or peoples health.Language points1. These chemicals in the food supply build up in peoples bodies over time.build up 增强增强; 建立；开发建立；开发 Hard working conditions b
11、uild up character. 艰苦的工作条件能磨练人的性格。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。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；造成导致；造成(后果）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。过量的工作和过少的休息会引起疾病。A
12、ll roads lead to Rome. 条条大道通罗马。条条大道通罗马。通往通往即学即练即学即练 用用lead to的适当形式完成句子。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联想联想 result in引起引起(某种结果某种结果)、使获得、使获得(某种成果某种成果)、结、结果果。如：。如：The accid
13、ent resulted in two deaths.result from由由造成、因造成、因而产生。如：而产生。如：Sickness sometimes results from eating too much.含介词含介词to的东侧短语：的东侧短语：come to 来到，苏醒来到，苏醒refer to 参考，参考， 涉及涉及look forward to 盼望盼望pay attention to 注意注意stick to 坚持坚持devote to 致力于致力于turn to get close to 靠近靠近3. They focus on keeping their soil ric
14、h and free of disease.focus on:集中集中(注意力，精力等）于注意力，精力等）于 Focus on life.focus ones attention on 集中注意力于集中注意力于focus ones mind on 把心思集中到把心思集中到上上You should focus your attention on your work.你应该把注意力集中在你的工作上。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。他需要更集中于他的事业。He needs to focus more on his career.瞄准生活。瞄准生活。4. reduce vt
15、. 减少，减缩减少，减缩 They have to reduce expenses this year. 他们今年必须削减开支。他们今年必须削减开支。 搭配搭配 reduce to 减到，降到减到，降到 reduce by 减了，减了， 降了降了 Please reduce_ 2% off the invoice price. The water will freeze when the thermograph reduces _ zero centigrade.5. This also keeps the air, soil, water and crops free from chemic
16、als.这样还可以让空气、土壤、水以及农作物不受化学这样还可以让空气、土壤、水以及农作物不受化学物质的污染。物质的污染。keep free from/of使使免受免受(影响影响/伤害等伤害等)锻炼能使我们摆脱疾病。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。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
17、put important minerals back into the soil, making it ready for crops such as wheat or corn that need rich and fertile soil. 分析分析 本句结构比较复杂。其主干结构为本句结构比较复杂。其主干结构为: 主句主句(Crops put important minerals back into the soil) + 状语状语(making it ready for crops)。状语中又包含状语中又包含“make + it + 形容词形容词”结构和由结构和由that引引导的定语从
18、句导的定语从句(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. 分析分析本句的主干结构是一个简单句本句的主干结构是一个简单句, 其结构是其结构是: 主语主语(farmers
19、) + 谓语谓语(prefer) + 并列宾语并列宾语(planting . + leaving .)。其中其中between crops和和in the ground作地点状语。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（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和和to become a natural fertilizer for the next years crop）。）。 para1: A new discovery of scientists.para2: Sev
20、eral 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 methodsillustration（阐明）（阐明）comparison conclusionThe type of the article
21、is_exposition（说明文）（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: The advantages of using organic farming. para4: Some methods to keep the soil fertile
22、.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 production.Long-term use of chemical fertilizers can cause damage to the land and , e
23、ven 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 fertilizers. There are three problems.First, they can damage as well as . They also stay in
24、 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 disease and keeping the air , soil, water and crops free from chemicals.Tips: several phras
25、es can be used. The methods to keep the soil fertile1 using natural waste from animals as fertilizer. 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 to avoid damaging the env
26、ironment or peoples health.Language points1. These chemicals in the food supply build up in peoples bodies over time.build up 增强增强; 建立；开发建立；开发 Hard working conditions build up character. 艰苦的工作条件能磨练人的性格。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。他病后逐步恢复体力。2. Many of thes
27、e chemicals can lead to cancer or other illnesses.lead to: 导致；造成导致；造成(后果）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。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。条条大道通罗马。通往通往即学即练即学即练 用用lead to的适当形式完成句子。的适当形式完成句子。1. Students should always remember that hard work i
28、s the main way which _ success.2. The bad weather _ a terrible accident a few days ago.leads toled to联想联想 result in引起引起(某种结果某种结果)、使获得、使获得(某种成果某种成果)、结、结果果。如：。如：The accident resulted in two deaths.result from由由造成、因造成、因而产生。如：而产生。如：Sickness sometimes results from eating too much.含介词含介词to的东侧短语：的东侧短语：come
29、 to 来到，苏醒来到，苏醒refer to 参考，参考， 涉及涉及look forward to 盼望盼望pay attention to 注意注意stick to 坚持坚持devote to 致力于致力于turn to get close to 靠近靠近3. They focus on keeping their soil rich and free of disease.focus on:集中集中(注意力，精力等）于注意力，精力等）于 Focus on life.focus ones attention on 集中注意力于集中注意力于focus ones mind on 把心思集中到把心
30、思集中到上上You should focus your attention on your work.你应该把注意力集中在你的工作上。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。他需要更集中于他的事业。He needs to focus more on his career.瞄准生活。瞄准生活。4. reduce vt. 减少，减缩减少，减缩 They have to reduce expenses this year. 他们今年必须削减开支。他们今年必须削减开支。 搭配搭配 reduce to 减到，降到减到，降到 reduce by 减了，减了， 降了降了 Please r
31、educe_ 2% off the invoice price. The water will freeze when the thermograph reduces _ zero centigrade.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。物质的污染。keep free from/of使使免受免受(影响影响/伤害等伤害等)锻炼能使我们摆脱疾病。锻炼能使我们摆脱疾病。Exercise can k
32、eep us free from disease. 联合国正试图使世界免受战争的威胁。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. 分析分析 本句结
33、构比较复杂。其主干结构为本句结构比较复杂。其主干结构为: 主句主句(Crops put important minerals back into the soil) + 状语状语(making it ready for crops)。状语中又包含状语中又包含“make + it + 形容词形容词”结构和由结构和由that引引导的定语从句导的定语从句(that need rich and fertile soil)。 7. Some organic farmers prefer planting grass between crops to prevent wind or water from
34、carrying away the soil, and then leaving it in the ground to become a natural fertilizer for the next years crop. 分析分析本句的主干结构是一个简单句本句的主干结构是一个简单句, 其结构是其结构是: 主语主语(farmers) + 谓语谓语(prefer) + 并列宾语并列宾语(planting . + leaving .)。其中其中between crops和和in the ground作地点状语。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（两个宾语后面又分别带有一个不
35、定式作目的状语（to prevent wind or water from carrying away the soil和和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 of using organic farming. para4: Some methods to keep the s
36、oil fertile.The structure of this passagePara1 TopicPara2 ProblemsPara3 AdvantagesPara4 Several methodsillustration（阐明）（阐明）comparison conclusionThe type of the article is_exposition（说明文）（说明文）1 Why are chemical fertilizers so popular in farming today? 2 After the long-term use of chemical fertilizers
37、, 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, therefore; meanwhile; anyhow; thus ;otherwise; moreov
38、er; 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; finally;last but not least ,etc.Read paragraph 3-4 Wh
39、at 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 as fertilizer. 2 changi
40、ng 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 to avoid damaging the environment or peoples health.para1: A new discovery of scientists.para2: Several problems caused by using chemic
41、al 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）（阐明）comparison conclusionThe type of the article is_exposition（说明文）（说明文）Language poin
42、ts1. These chemicals in the food supply build up in peoples bodies over time.build up 增强增强; 建立；开发建立；开发 Hard working conditions build up character. 艰苦的工作条件能磨练人的性格。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。他病后逐步恢复体力。2. Many of these chemicals can lead to cancer or other
43、illnesses.lead to: 导致；造成导致；造成(后果）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。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。条条大道通罗马。通往通往即学即练即学即练 用用lead to的适当形式完成句子。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 ba
44、d weather _ a terrible accident a few days ago.leads toled to联想联想 result in引起引起(某种结果某种结果)、使获得、使获得(某种成果某种成果)、结、结果果。如：。如：The accident resulted in two deaths.result from由由造成、因造成、因而产生。如：而产生。如：Sickness sometimes results from eating too much.含介词含介词to的东侧短语：的东侧短语：come to 来到，苏醒来到，苏醒refer to 参考，参考， 涉及涉及look f
45、orward to 盼望盼望pay attention to 注意注意stick to 坚持坚持devote to 致力于致力于turn to get close to 靠近靠近3. They focus on keeping their soil rich and free of disease.focus on:集中集中(注意力，精力等）于注意力，精力等）于 Focus on life.focus ones attention on 集中注意力于集中注意力于focus ones mind on 把心思集中到把心思集中到上上You should focus your attention on
46、 your work.你应该把注意力集中在你的工作上。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。他需要更集中于他的事业。He needs to focus more on his career.瞄准生活。瞄准生活。4. reduce vt. 减少，减缩减少，减缩 They have to reduce expenses this year. 他们今年必须削减开支。他们今年必须削减开支。 搭配搭配 reduce to 减到，降到减到，降到 reduce by 减了，减了， 降了降了 Please reduce_ 2% off the invoice price. The wat
47、er will freeze when the thermograph reduces _ zero centigrade.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。物质的污染。keep free from/of使使免受免受(影响影响/伤害等伤害等)锻炼能使我们摆脱疾病。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
48、威胁。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. 分析分析 本句结构比较复杂。其主干结构为本句结构比较复杂。其主干结构为: 主句主句(Crops
49、put important minerals back into the soil) + 状语状语(making it ready for crops)。状语中又包含状语中又包含“make + it + 形容词形容词”结构和由结构和由that引引导的定语从句导的定语从句(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
50、 it in the ground to become a natural fertilizer for the next years crop. 分析分析本句的主干结构是一个简单句本句的主干结构是一个简单句, 其结构是其结构是: 主语主语(farmers) + 谓语谓语(prefer) + 并列宾语并列宾语(planting . + leaving .)。其中其中between crops和和in the ground作地点状语。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（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 ca