人教版（2019）选择性必修第一册Unit5 Working the land period5 Chemical versus organic farming课件(37张ppt)
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| 名称 | 人教版（2019）选择性必修第一册Unit5 Working the land period5 Chemical versus organic farming课件(37张ppt) |  | |
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| 资源类型 | 教案 | ||
| 版本资源 | 人教版（2019） | ||
| 科目 | 英语 | ||
| 更新时间 | 2022-05-15 20:46:16 | ||
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(共37张PPT)
Chemical versus organic farming
Period 5
Unit 5 Working the Land
选择性必修一
人教版（2019）
He is spraying pesticide
What are they doing？
He is using organic fertilizer
Lead-in
Lead-in
He is fertilizing the soil
What is chemical farming
Lead-in
Lead-in
Chemical farming is farming using chemical
pesticides and artificial fertilizers
What is organic farming
Lead-in
Lead-in
Organic farming is not pesticide, fertilizer, and other synthetic growth agents of production, but use manure for fertilizer and other organic fertilizers.
Reading
3. widespread adj.
Chemical pesticides and artificial
fertilisers have been in widespread use in farming since the middle of the 20th
century. When they were first
introduced, many farmers welcomed
them as a great way to fight crop
disease and increase production. Over
time, however, what some scientists
have found is that their long-term use
can sometimes harm both the land and
people’s health.
para.1
chemical pesticides
2. artificial fertilisers
Question Time
Read the text and answer the following questions.
1. Why did many farmers welcome the introduction of chemical farming
Many farmers welcomed them as a great way to fight crop diseases and increase production.
Paragraph1 细节理解
Question Time
Read the text and answer the following questions.
2. What concerns many people about the use of pesticides
Their long-term use can sometimes harm both the land and people’s health.
Paragraph1 细节理解
Reading
6. in turn
For example, pesticides can damage the land by killing not only harmful bacteria and insects, but also helpful ones. In addition, these chemicals can stay in the soil and underground water sources for a long time. This affects the crops grown on the land and, in turn, the animals and humans who digest them. Many people worry that these chemicals may make them ill and even cause cancer.
para.2
4. bacteria
5. digest
Reading
In fact, some pesticides like DDT have been prohibited in most countries because of the damage they cause to people and the environment. As for chemical fertilisers, crops grown with them usually grow too fast to be rich in nutrition. They may look beautiful on the outside, but inside there is usually more water than essential minerals, and they often have less flavour as well.
8. nutrition n.
9. essential adj.
para.2
prohibit v.
mineral n.
Reading
As an alternative, some farmers have switched to organic farming, and many customers have turned to organic food when they shop at the local grocery. Organic farming is simply farming without using any chemicals. Organic farmers on keeping their soil rich and free of disease through natural means. For example, many organic farmers use natural waste from animals as fertiliser. This makes the soil in their fields richer in minerals. It also keeps the air, soil, water, and crops free of chemicals.
para.3
vocabulary
alternative n/adj.
12. grocery
13. free of
Question Time
Read the text and answer the following questions.
3. What is one problem with the use of chemical fertilizers
Crops grown with them usually grow too fast to be rich in nutrition.
Paragraph2 细节理解
4. How is organic farming different from chemical farming
Paragraph3 细节理解
Organic farming is simply farming without using any chemicals. Organic farmers focus on keeping their soil rich and free of disease through natural means.
Reading
Organic farmers also use many other methods to produce rich soil. They often change the kind of crop grown in each field every year. For instance, they may grow corn or wheat in a field one year, and then grow beans there the next. Why different crops are grown is because they put important minerals back into the ground, making it ready for the next batch of crops.
para. 4
vocabulary
14. instance n.
for instance
15. ……, making it ready for the next batch of crops.
V-ing 做结果状语（自然而然的结果）
Reading
Organic farmers also plant diverse crops that use different depths of soil to help keep it rich. For example peanuts grow on the ground’s surface, but many other vegetables put down deep roots. The goal of using different organic farming methods is to grow good food while avoiding damage to the environment or to people’s health.
16. depth n.
17. root n.
put down deep roots
para. 4
Question Time
Read the text and answer the following questions.
5. Why do organic farmers change the kind of crop grown in a
field every year
Different crops are grown because they put important minerals back into the ground, making it ready for the next batch of crops.
Paragraph4 推理判断
Question Time
Read the text and answer the following questions.
6. What is the goal of using organic farming methods Do you think it can be reached Why or why not
1）The goal of using organic farming methods is to grow good food while avoiding damage to the environment or to people’s health.
2） Yes, I think this goal can be reached.
People’s awareness of eating organic foods is increasing. And farmers worked for centuries without using any kinds of chemicals and without harming the environment, and the food they produced was just fine.
Paragraph4 细节理解+观点态度
Reading
Some people would prefer to stop the use of man-made chemicals in agriculture entirely. What keeps them from doing so is the fact that chemical farming serves the high demand for food around the world. Organic farming is nowhere near able to meet that need. Therefore, there is still a long way to find a suitable solution that puts sufficient food on the dinner table while keeping people and the environment as healthy as possible.
vocabulary
18. entirely adv.
19. What keeps them from doing so is the fact that chemical farming serves the high demand for food around the world.
what引导主语从句，在从句中做主语；that引导同位语从句，是the fact的同位语。
para. 5
Question Time
Read the text and answer the following questions.
7. Why could some people not choose but use man-made chemicals in agriculture？
Because chemical farming still serves the high demand for food around the world and organic farming is nowhere near able to meet the need.
Paragraph5 细节理解
Reading
Read the passage carefully and complete the sentences in the table.
Kind Detail
Chemical farming Advantages: a great way to
Disadvantages : kill
affect
Organic farming Advantages: The soil is rich in
Keep free of chemicals Avoid damage to
Disadvantages :
The writer’s view
fight crops disease and
increase production.
helpful bacteria and insects
crops, animals and people
minerals
the air , soil , water , and crops
the environment or to people’s health
nowhere near able to meet the need.
There is still a long way to find a suitable solution
Group show
Match the main ideas (A-D) below with the paragraphs.
Paragraph Main idea
1-2
3
4
5
A What organic farming is
B Why man-made chemicals are still used in farming
C Organic methods for producing rich soil
D The problems with chemical farming
D
A
C
B
Group show
Complete the sentences in the table.
Paragraph Detail
1-2 Pesticides can kill helpful .
Some pesticides have been because of the .
Crops grown with chemical fertilisers usually
to be full of .
3 Many organic farmers use as fertiliser.
bacteria and insects
prohibited
damage they cause
natural waste from animals
grow too fast
nutrition
Group show
Complete the sentences in the table.
Paragraph Detail
4 They often grown in each field .
They also plant crops that use of the soil to help keep it rich.
5 Organic farming is nowhere near able to meet the high .
change the kind of crop
every year
different depths
demand for food around the world
Study
adj.完全必要的;极其重要的
Water is essential to life, so we should save water.
对……很重要
be essential to/for
It is essential that...(should) do...
做……是完全必要的
It is essential for sb to do...
对某人来说做……是完全必要的
Study
1）对于这份工作，耐心是非常重要的。
Patience is essential for this job.
It is essential that effective measures be taken to protect our
environment.
2）有必要采取有效的措施来保障我们的环境。
When we learn a language , it is essential for us to learn vocabulary.
3）当我们学某种语言时，我们有必要学词汇。
Study
n．可供选择的事物 adj.可供替代的；非传统的
He has the alternative of going to college or working.
……的替代品
an alternative to
have no alternative but to do sth
别无选择只好做某事
have the alternative of doing sth
有做某事的选择
Study
1）由于疫情封锁（ coronavirus lockdown ），他除了居家别无选择。
Due to the coronavirus lockdown, he has no alternative but to stay at home.
We have the alternative plans of having a picnic or climbing a hill.
2）我们在去野餐或者去爬山两个计划中只能选一样。
As an alternative, some farmers have switched to organic farming.
3）作为一种选择,一些农民已经转向有机农业。
Study
为什么要种植不同的作物,是因为他们把重要的矿物质放回地里,让它再
次为下一批作物做准备。
Why different crops are grown is because they put important minerals back
into the ground , making it ready again for the next batch of crops.
动词-ing形式短语做结果状语表示自然而然的结果，常用逗号与主句隔开,
有时在其前加副词thus;动词不定式做结果状语往往表示出乎意料的结果
或不好的结果,其前常加only。
动词-ing形式短语做结果状语。
Study
1）他跑到火车站,却发现火车已开走了。
He ran to the station , only to find the train had left.
The car was caught in a traffic jam , thus causing the delay.
2）这辆车遇到了交通堵塞,结果晚点了。
The hospital has recently obtained new medical equipment, allowing more
patients to be treated.
3）近期这个医院购进了新的医疗设备，允许更多的病人被治疗。
Group work
Discuss the advantages and disadvantages of chemical farming and organic farming. And tell which one you prefer and why.
Tips:
Chemical farming
Advantages: fight crop diseases, increase production (serve the high demand for food around the world)
Disadvantages: 1)pesticide can harm land and people’s health, kill helpful bacteria and insects and stay for a long time and affect crops, animals and people
2)chemical fertilizer are not rich in nutrition and have less flavor
Group work
Discuss the advantages and disadvantages of chemical farming and organic farming. And tell which one you prefer and why.
Tips:
Organic farming
Advantages: keep soil rich and free from disease through natural means
Details: natural waste from animals as fertilizer
change the kind of crop in each field every year
plant diverse crops using different depths of soil
Disadvantages: unable to serve the high demand for food around
the world
Group work
Write an short passage to show whether you support chemical farming or organic farming. (Following the format of an argumentative essay.
Topic sentence: In my opinion, farming is preferable
to farming because .
Point 1: .
(Detail) .
Point 2: .
(Detail) .
Point 3: .
(Detail) .
Conclusion: .
Group work
Discuss the difference between traditional agriculture and modern agriculture. And tell which one you prefer and why.
Topic The difference between traditional agriculture and modern agriculture
Tense The simple present tense
Outline P1 Your opinion
P2 Compare the difference
P3 Conclusion
Group work
Discuss the difference between traditional agriculture and modern agriculture. And tell which one you prefer and why.
Key words output working efficiency fertilisers pesticides environment
Key sentences In my opinion, is preferable to .
most farmers grow crops with the help of modern machines instead of planting crops with their hands.
In a word .
Highlights What’s more, the output and working efficiency are also improved greatly, which contributes a lot to social-economic development.
Group show
Exchange your draft with a partner. Use the checklist to help you review your partner’s draft.
Share your essay with the rest of the class.
Groups Achievements
Group1
Group2
Group3
Group4 ……
Group show
In my opinion, modern agriculture is preferable to traditional agriculture.
First of all, nowadays most farmers grow crops with the help of modern machines instead of planting crops with their hands. As a result, modern farmers no longer need to work so hard as before. What’s more, the output and working efficiency are also improved greatly, which contributes a lot to social-economic development. Although the fertilisers and pesticides used in modern agriculture have destroyed the environment badly, experts are making efforts to get rid of them and paying more attention to the plant nutrition and protection.
In a word，I am in favor of modern agriculture.
One possible version：
Exercise
1. Sun and water are essential the growth of crops.
2.It is essential that you (learn) Chinese history.
4.I had no alternative but (accept) the offer.
3.By 1921,however,peanut had become a real alternative cotton.
5. The cooling wind swept through out bedroom windows, （make）
air conditioning unnecessary.
to/for
(should) learn
to
to accept
making
Summary
We've learned the following in the class：
Homework
Use what you have learned to write an introduction chemical farming and organic farming. And tell which one you prefer and why.
（80-120词左右）
Chemical versus organic farming
Period 5
Unit 5 Working the Land
选择性必修一
人教版（2019）
He is spraying pesticide
What are they doing？
He is using organic fertilizer
Lead-in
Lead-in
He is fertilizing the soil
What is chemical farming
Lead-in
Lead-in
Chemical farming is farming using chemical
pesticides and artificial fertilizers
What is organic farming
Lead-in
Lead-in
Organic farming is not pesticide, fertilizer, and other synthetic growth agents of production, but use manure for fertilizer and other organic fertilizers.
Reading
3. widespread adj.
Chemical pesticides and artificial
fertilisers have been in widespread use in farming since the middle of the 20th
century. When they were first
introduced, many farmers welcomed
them as a great way to fight crop
disease and increase production. Over
time, however, what some scientists
have found is that their long-term use
can sometimes harm both the land and
people’s health.
para.1
chemical pesticides
2. artificial fertilisers
Question Time
Read the text and answer the following questions.
1. Why did many farmers welcome the introduction of chemical farming
Many farmers welcomed them as a great way to fight crop diseases and increase production.
Paragraph1 细节理解
Question Time
Read the text and answer the following questions.
2. What concerns many people about the use of pesticides
Their long-term use can sometimes harm both the land and people’s health.
Paragraph1 细节理解
Reading
6. in turn
For example, pesticides can damage the land by killing not only harmful bacteria and insects, but also helpful ones. In addition, these chemicals can stay in the soil and underground water sources for a long time. This affects the crops grown on the land and, in turn, the animals and humans who digest them. Many people worry that these chemicals may make them ill and even cause cancer.
para.2
4. bacteria
5. digest
Reading
In fact, some pesticides like DDT have been prohibited in most countries because of the damage they cause to people and the environment. As for chemical fertilisers, crops grown with them usually grow too fast to be rich in nutrition. They may look beautiful on the outside, but inside there is usually more water than essential minerals, and they often have less flavour as well.
8. nutrition n.
9. essential adj.
para.2
prohibit v.
mineral n.
Reading
As an alternative, some farmers have switched to organic farming, and many customers have turned to organic food when they shop at the local grocery. Organic farming is simply farming without using any chemicals. Organic farmers on keeping their soil rich and free of disease through natural means. For example, many organic farmers use natural waste from animals as fertiliser. This makes the soil in their fields richer in minerals. It also keeps the air, soil, water, and crops free of chemicals.
para.3
vocabulary
alternative n/adj.
12. grocery
13. free of
Question Time
Read the text and answer the following questions.
3. What is one problem with the use of chemical fertilizers
Crops grown with them usually grow too fast to be rich in nutrition.
Paragraph2 细节理解
4. How is organic farming different from chemical farming
Paragraph3 细节理解
Organic farming is simply farming without using any chemicals. Organic farmers focus on keeping their soil rich and free of disease through natural means.
Reading
Organic farmers also use many other methods to produce rich soil. They often change the kind of crop grown in each field every year. For instance, they may grow corn or wheat in a field one year, and then grow beans there the next. Why different crops are grown is because they put important minerals back into the ground, making it ready for the next batch of crops.
para. 4
vocabulary
14. instance n.
for instance
15. ……, making it ready for the next batch of crops.
V-ing 做结果状语（自然而然的结果）
Reading
Organic farmers also plant diverse crops that use different depths of soil to help keep it rich. For example peanuts grow on the ground’s surface, but many other vegetables put down deep roots. The goal of using different organic farming methods is to grow good food while avoiding damage to the environment or to people’s health.
16. depth n.
17. root n.
put down deep roots
para. 4
Question Time
Read the text and answer the following questions.
5. Why do organic farmers change the kind of crop grown in a
field every year
Different crops are grown because they put important minerals back into the ground, making it ready for the next batch of crops.
Paragraph4 推理判断
Question Time
Read the text and answer the following questions.
6. What is the goal of using organic farming methods Do you think it can be reached Why or why not
1）The goal of using organic farming methods is to grow good food while avoiding damage to the environment or to people’s health.
2） Yes, I think this goal can be reached.
People’s awareness of eating organic foods is increasing. And farmers worked for centuries without using any kinds of chemicals and without harming the environment, and the food they produced was just fine.
Paragraph4 细节理解+观点态度
Reading
Some people would prefer to stop the use of man-made chemicals in agriculture entirely. What keeps them from doing so is the fact that chemical farming serves the high demand for food around the world. Organic farming is nowhere near able to meet that need. Therefore, there is still a long way to find a suitable solution that puts sufficient food on the dinner table while keeping people and the environment as healthy as possible.
vocabulary
18. entirely adv.
19. What keeps them from doing so is the fact that chemical farming serves the high demand for food around the world.
what引导主语从句，在从句中做主语；that引导同位语从句，是the fact的同位语。
para. 5
Question Time
Read the text and answer the following questions.
7. Why could some people not choose but use man-made chemicals in agriculture？
Because chemical farming still serves the high demand for food around the world and organic farming is nowhere near able to meet the need.
Paragraph5 细节理解
Reading
Read the passage carefully and complete the sentences in the table.
Kind Detail
Chemical farming Advantages: a great way to
Disadvantages : kill
affect
Organic farming Advantages: The soil is rich in
Keep free of chemicals Avoid damage to
Disadvantages :
The writer’s view
fight crops disease and
increase production.
helpful bacteria and insects
crops, animals and people
minerals
the air , soil , water , and crops
the environment or to people’s health
nowhere near able to meet the need.
There is still a long way to find a suitable solution
Group show
Match the main ideas (A-D) below with the paragraphs.
Paragraph Main idea
1-2
3
4
5
A What organic farming is
B Why man-made chemicals are still used in farming
C Organic methods for producing rich soil
D The problems with chemical farming
D
A
C
B
Group show
Complete the sentences in the table.
Paragraph Detail
1-2 Pesticides can kill helpful .
Some pesticides have been because of the .
Crops grown with chemical fertilisers usually
to be full of .
3 Many organic farmers use as fertiliser.
bacteria and insects
prohibited
damage they cause
natural waste from animals
grow too fast
nutrition
Group show
Complete the sentences in the table.
Paragraph Detail
4 They often grown in each field .
They also plant crops that use of the soil to help keep it rich.
5 Organic farming is nowhere near able to meet the high .
change the kind of crop
every year
different depths
demand for food around the world
Study
adj.完全必要的;极其重要的
Water is essential to life, so we should save water.
对……很重要
be essential to/for
It is essential that...(should) do...
做……是完全必要的
It is essential for sb to do...
对某人来说做……是完全必要的
Study
1）对于这份工作，耐心是非常重要的。
Patience is essential for this job.
It is essential that effective measures be taken to protect our
environment.
2）有必要采取有效的措施来保障我们的环境。
When we learn a language , it is essential for us to learn vocabulary.
3）当我们学某种语言时，我们有必要学词汇。
Study
n．可供选择的事物 adj.可供替代的；非传统的
He has the alternative of going to college or working.
……的替代品
an alternative to
have no alternative but to do sth
别无选择只好做某事
have the alternative of doing sth
有做某事的选择
Study
1）由于疫情封锁（ coronavirus lockdown ），他除了居家别无选择。
Due to the coronavirus lockdown, he has no alternative but to stay at home.
We have the alternative plans of having a picnic or climbing a hill.
2）我们在去野餐或者去爬山两个计划中只能选一样。
As an alternative, some farmers have switched to organic farming.
3）作为一种选择,一些农民已经转向有机农业。
Study
为什么要种植不同的作物,是因为他们把重要的矿物质放回地里,让它再
次为下一批作物做准备。
Why different crops are grown is because they put important minerals back
into the ground , making it ready again for the next batch of crops.
动词-ing形式短语做结果状语表示自然而然的结果，常用逗号与主句隔开,
有时在其前加副词thus;动词不定式做结果状语往往表示出乎意料的结果
或不好的结果,其前常加only。
动词-ing形式短语做结果状语。
Study
1）他跑到火车站,却发现火车已开走了。
He ran to the station , only to find the train had left.
The car was caught in a traffic jam , thus causing the delay.
2）这辆车遇到了交通堵塞,结果晚点了。
The hospital has recently obtained new medical equipment, allowing more
patients to be treated.
3）近期这个医院购进了新的医疗设备，允许更多的病人被治疗。
Group work
Discuss the advantages and disadvantages of chemical farming and organic farming. And tell which one you prefer and why.
Tips:
Chemical farming
Advantages: fight crop diseases, increase production (serve the high demand for food around the world)
Disadvantages: 1)pesticide can harm land and people’s health, kill helpful bacteria and insects and stay for a long time and affect crops, animals and people
2)chemical fertilizer are not rich in nutrition and have less flavor
Group work
Discuss the advantages and disadvantages of chemical farming and organic farming. And tell which one you prefer and why.
Tips:
Organic farming
Advantages: keep soil rich and free from disease through natural means
Details: natural waste from animals as fertilizer
change the kind of crop in each field every year
plant diverse crops using different depths of soil
Disadvantages: unable to serve the high demand for food around
the world
Group work
Write an short passage to show whether you support chemical farming or organic farming. (Following the format of an argumentative essay.
Topic sentence: In my opinion, farming is preferable
to farming because .
Point 1: .
(Detail) .
Point 2: .
(Detail) .
Point 3: .
(Detail) .
Conclusion: .
Group work
Discuss the difference between traditional agriculture and modern agriculture. And tell which one you prefer and why.
Topic The difference between traditional agriculture and modern agriculture
Tense The simple present tense
Outline P1 Your opinion
P2 Compare the difference
P3 Conclusion
Group work
Discuss the difference between traditional agriculture and modern agriculture. And tell which one you prefer and why.
Key words output working efficiency fertilisers pesticides environment
Key sentences In my opinion, is preferable to .
most farmers grow crops with the help of modern machines instead of planting crops with their hands.
In a word .
Highlights What’s more, the output and working efficiency are also improved greatly, which contributes a lot to social-economic development.
Group show
Exchange your draft with a partner. Use the checklist to help you review your partner’s draft.
Share your essay with the rest of the class.
Groups Achievements
Group1
Group2
Group3
Group4 ……
Group show
In my opinion, modern agriculture is preferable to traditional agriculture.
First of all, nowadays most farmers grow crops with the help of modern machines instead of planting crops with their hands. As a result, modern farmers no longer need to work so hard as before. What’s more, the output and working efficiency are also improved greatly, which contributes a lot to social-economic development. Although the fertilisers and pesticides used in modern agriculture have destroyed the environment badly, experts are making efforts to get rid of them and paying more attention to the plant nutrition and protection.
In a word，I am in favor of modern agriculture.
One possible version：
Exercise
1. Sun and water are essential the growth of crops.
2.It is essential that you (learn) Chinese history.
4.I had no alternative but (accept) the offer.
3.By 1921,however,peanut had become a real alternative cotton.
5. The cooling wind swept through out bedroom windows, （make）
air conditioning unnecessary.
to/for
(should) learn
to
to accept
making
Summary
We've learned the following in the class：
Homework
Use what you have learned to write an introduction chemical farming and organic farming. And tell which one you prefer and why.
（80-120词左右）