高中英语M4-Chemical-or-Organic-Farming读写教学概要写作公开课精品课件.pptx

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1、Organic foodsNon-organic foodsnaturalchemical freeartificialusing chemicals(fertilizers/pesticides)traditionalconventionalChemical or Organic Farming?Read&ShareWhat can we get from the passage?Which one does the author prefer?Over the past half century,using chemical fertilizers has become very comm

2、on in farming.Many farmers welcome them as a great way to stop crop disease and increase production.Recently,however,scientists have been finding that long-term use of these fertilizers can cause damage to the land and,even more dangerous,to peoples health.Para.1Over the past half century,using chem

3、ical fertilizers has become very common in farming.Many farmers welcome them as a great way to stop crop disease and increase production.Recently,however,scientists have been finding that long-term use of these fertilizers can cause damage to the land and,even more dangerous,to peoples health.benefi

4、cial positive effectsharmfulnegative effectshoweverPara.1 effects of chemical fertilizerspositive&negativeTip 1:Signal words(like however,but,nevertheless)help get the key information quickly.stop crop diseaseincrease productiondamage the land and peoples healthWhat are some of the problems caused b

5、y chemical fertilizers?First,they damage the land by killing the helpful bacteria and pests as well as the harmful ones.Chemicals also stay in the ground and underground water for a long time.This affects crops and,therefore,animals and humans,since chemicals get inside the crops and cannot just be

6、washed off.These chemicals in the food supply build up in peoples bodies over time.Many of these chemicals can lead to cancer or other illnesses.In addition,fruit,vegetables and other food grown with chemical fertilizers usually grow too fast to be full of much nutrition.They may look beautiful,but

7、inside there is usually more water than vitamins and minerals.Para.2What are some of the problems caused by chemical fertilizers?First,they damage the land by killing the helpful bacteria and pests as well as the harmful ones.Chemicals also stay in the ground and underground water for a long time.Th

8、is affects crops and,therefore,animals and humans,since chemicals get inside the crops and cannot just be washed off.These chemicals in the food supply build up in peoples bodies over time.Many of these chemicals can lead to cancer or other illnesses.In addition,fruit,vegetables and other food grown

9、 with chemical fertilizers usually grow too fast to be full of much nutrition.They may look beautiful,but inside there is usually more water than vitamins and minerals.problemsFirst,alsoIn addition,Para.2 problems caused by chemical fertilizers-damaging the land,crops,and humansdamage the land affec

10、ts crops,animals and humans,too fast to be full of much nutrition.Tip 2:Signal words(like first,also,besides,in addition)help list main points clearly.With these discoveries,some farmers and many customers are beginning to turn to organic farming.Organic farming is simply farming without using any c

11、hemicals.They focus on keeping their soil rich and free of disease.A healthy soil reduces disease and helps crops grow strong and healthy.Organic farmers,therefore,often prefer using natural waste from animals as fertilizer.They feel that this makes the soil in their fields richer in minerals and so

12、 more fertile.This also keeps the air,soil,water and crops free from chemicals.Para.3With these discoveries,some farmers and many customers are beginning to turn to organic farming.Organic farming is simply farming without using any chemicals.They focus on keeping their soil rich and free of disease

13、.A healthy soil reduces disease and helps crops grow strong and healthy.Organic farmers,therefore,often prefer using natural waste from animals as fertilizer.They feel that this makes the soil in their fields richer in minerals and so more fertile.This also keeps the air,soil,water and crops free fr

14、om chemicals.Para.3 advantages of organic farming keeping the soil rich and free of disease reduce disease and help crops grow bettermake the soil richer and more fertilekeep the air,soil,water,and crops free from chemicalsWith these discoveries,some farmers and many customers are beginning to turn

15、to organic farming.Organic farming is simply farming without using any chemicals.They focus on keeping their soil rich and free of disease.A healthy soil reduces disease and helps crops grow strong and healthy.Organic farmers,therefore,often prefer using natural waste from animals as fertilizer.They

16、 feel that this makes the soil in their fields richer in minerals and so more fertile.This also keeps the air,soil,water and crops free from chemicals.Para.3 advantages of organic farming-keeping the soil fertile and healthy keep the soil rich and free of disease reduce disease and help crops grow b

17、ettermake the soil richer and more fertilekeep the air,soil,water,and crops free from chemicalsTip 3:Sometimes,generalizing the repeated words can help simplify the summary.Organic farmers also use many other methods to keep the soil fertile.They often change the kind of crop in each field every few

18、 years,for example,growing corn or wheat and then the next year per peas or soybeans.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.Organic farmers also plant crops to use different levels of so

19、il,for example,planting peanuts that use the grounds surface followed by vegetables that put down deep roots.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 yea

20、rs crop.These many different organic farming methods have the same goal:to grow food and avoid damaging the environment or peoples health.Para.4Organic farmers also use many other methods to keep the soil fertile.They often change the kind of crop in each field every few years,for example,growing co

21、rn or wheat and then the next year per peas or soybeans.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.Organic farmers also plant crops to use different levels of soil,for example,planting peanu

22、ts that use the grounds surface followed by vegetables that put down deep roots.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.These many different

23、organic farming methods have the same goal:to grow food and avoid damaging the environment or peoples health.different methodsPara.4 other methods to keep the soil fertilechange the kind of crop every few yearsplant crops to use different levels of soilplant grass between crops for example,for examp

24、le,same goalTip 4:When summarizing,extra information(examples,details)can usually be ignored.Para.1 effects of chemical fertilizers(positive vs negative)Para.4 other methods to keep the soil fertilePara.3 advantages of organic farming Para.2 problems caused by chemical fertilizersWhat WhyHowWith the

25、se discoveries,.To solve these problems,farmers turn to,because also use many other methods.Apart from there also some other methods like.Tip 4:Transitional sentences help link sentences and paragraphs together smoothly.Summary time!Write a summary of this passage based on our analysis.Try to includ

26、e all the points clearly and concisely.Attention!When writing a summary,do not copy from the passage!Instead,use your own words!HomeworkHomeworkFinish your summaries.Share with your partner and give each other comments.Thank you!Thank you!Tip 1:Use different subjects to restate the sentence.Tip 2:Us

27、e different sentence patterns to restate the sentence.Tip 3:Use different verb forms to restate the sentence.Attention!When writing a summary,do not copy from the passage!Instead,use your own words to restate it!Tip 4:Use general words to summarize the details.Summary writing:Chemical or Organic Far

28、ming?Although chemical farming has its positive effects,it also has negative effects.Despite its positive advantages,chemical farming also has negative effects.Scientists have discovered the negative effects of chemical effects despite its positive advantages.The negative effects of chemical effects

29、 cannot be ignored despite its positive advantages.Tip 1:Use different subjects to restate the sentence.Long-term use of these chemical fertilizers can damage the land,affect crops,animals,and humans.Products grown with chemical fertilizers usually grow too fast to be full of much nutrition.Long-ter

30、m use of chemical fertilizers can not only damage the land but also affect crops,animals,and humans.It is the long-term use of chemical fertilizers that leads to the less fertile land,less nutritious products,as well as sick animals and humans.As a result of long-term use of chemical fertilizers,the

31、 land gets less fertile,products are less nutritious.Besides,animals and humans are likely to get sick.Tip 1:Use different sentence patterns to restate the sentence.To solve these problems,people are turning to organic farming.To tackle these problems,organic farming comes into being.Therefore,people decide to adopt organic farming as a new way to solve these problems.Tip 3:Use different verbs to restate the sentence.Apart from using natural waste as fertilizers,there are also other methods of organic farming.