資源簡介

(共31張PPT)
Unit 5 Working the Land
Using Language
Chemical Versus Organic Farming
Learning objectives
1. know the difference between chemical farming and organic farming.
2. work out the content, structure and language features of the text;
3. know the writing skills of an argumentative essay, such as illustrating, giving examples or making contrast;
4. write your opinion in an essay about chemical farming or organic farming.
By the end of this period, students will be able to…
organic farming
chemical farming
organic farming
organic farming
chemical farming
organic farming
Make a judgement: which is chemical farming and which is organic farming.
Pre-reading
It is fertilizer.
What is the substance we put on the soil to make crops grow
What kind of fertilizers do farmers use
chemical fertilizers
natural fertilizers
Pre-reading
Natural waste from animals and dead plants
What're the advantages of organic farming
Do you usually eat organic food Do you think organic food are more healthy
What are the disadvantages of using chemical fertilizers
Organic Farming
Think＆discuss
Pre-reading:
Pre-reading: prediction
CHEMICAL VERSUS
ORGANIC FARMING
Read the text, check your prediction and answer the questions:
What is chemical farming
What is organic farming
　Task 1　 整體理解
while-reading:
A. What organic farming is
B. Why man-made chemical are still used in farming
C. Organic methods for producing rich soil
D. The problems with chemical farming
Para. 1-2
Para. 3
Para. 4
Para. 5
Read the text and then Match the main idea with each paragraph.
Chemical farming
Organic
farming
Thinking
while-reading:
Chemical farming
Vs
Organic farming
Chemical farming
organic farming
advantage
disadvantages
advantages
disadvantage
My choice/attitude
while-reading:
1. Why did many farmers welcome the introduction of chemical farming
Advantages:
Many farmers welcomed them as a great way to fight crop disease and increase production.
while-reading:
(Para1)
2. What concerns many people about the use of pesticides
Disadvantages:
Their long-term use can sometimes harm both the land and people’s health.
while-reading:
(Para1)
3. What is one problem with the use of chemical fertilisers (Para2)
Disadvantages:
Crops grown with them usually grow too fast to be rich in nutrition.
while-reading:
(Para2)
chemical farming
Advantages Disadvantages
1.
2. harming the land:
killing harmful __________________ as well as _____________
harming people’s health:
These chemicals may make people _____and even _______________
Crops grow too fast to be ___________________.
bacteria and insects
the helpful ones
ill
rich in nutrition
cause cancer
fight crop disease
increase production
(Para.1-2)
while-reading:
As an alternative, I’d like to switch to organic farming!
What is organic farming and how is it different from chemical farming
Organic farming is simply farming without using any chemicals.
Organic farmers focus on keeping their soil rich and free of disease through natural means.
while-reading:
Para 3
What are the organic methods mentioned in the text
1. use natural waste from animals as fertilizer.
2. change the kind of crop grown in each field every year.
3. plant diverse crops that use different depth of soil to keep it rich.
while-reading:
(Para3&4)
use natural waste from animals as fertilizer
change the kind of crop grown in each field every year.
to put important minerals back into the ground
to make the soil in the fields richer in minerals
plant diverse crops that use different depth of soil to keep it rich.
to keep the soil rich
Methods Purposes
Match the methods with its purpose(Para3&4)
while-reading:
while-reading:
What's the goal of using different organic farming methods
The goal of using different organic farming methods is to grow good food while avoiding damage to the environment or to people's health.
（Para.4）
while-reading:
（Para.5）
Why can’t we stop the use of man-made chemicals in agriculture
entirely
A. Organic farming cost us a lot of money.
B. Organic farming can meet people’s need.
C. Chemical farming brought us huge profit.
D. Chemical farming helps serve the need for food.
while-reading:
bacteria and insects
prohibited
damage they use
grow too fast
nutrition
natural waste from animals
every year
different depths
demand for food around the world
change the kind of crop
The problems with chemical farming
What organic farming
is
Organic methods for
producing rich soil
Why man-made
chemicals are still
used in farming
Ⅰ.閱讀課文，判斷信息正誤
(　　)1.Chemical pesticides and artificial fertilisers can fight crop disease and increase production.
(　　)2.Pesticides can damage the land by only killing harmful bacteria and insects.
(　　)3.Chemical fertilisers make crops grow fast to be rich in nutrition.
(　　)4.Organic farmers keep their soil rich and free of disease through natural means.
(　　)5.Organic farming serves the high demand for food around the world.
【答案】1－5　TFFTF
while-reading:
Ⅱ.閱讀課文，選擇正確選項
(　　)1.Why did many farmers welcome the introduction of chemical farming
A．They can fight crop disease and increase production.
B．They harm both the land and people’s health.
C．They can help produce rich soil.
D．They are not expensive.
A　
(　　)2.What concerns many people about the use of pesticides
A．Pesticides can damage the land.
B．Chemicals can stay in the soil for a long time.
C．Pesticides can kill harmful bacteria and insects.
D．Chemicals may make people ill and even cause cancer.
D　
while-reading:
(　　)3.Why do organic farmers change the kind of crop grown in each field every few years
A．It helps put important minerals back into the ground.
B．It can avoid damage to the environment.
C．It can help increase output.
D．The writer didn’t tell us.
A　
(　　)4.Why can’t we stop the use of man-made chemicals in agriculture entirely
A．Organic farming cost us a lot of money.
B．Organic farming can meet people’s need.
C．Chemical farming brought us huge profit.
D．Chemical farming helps serve the need for food.
D　
while-reading:
Post-reading:
Benefits — Problems — Solutions
Farming Benefit Problem Solution
Chemical farming
Organic farming
fight crop disease and increase production
sometimes harm both the land and people’s health
switch to organic farming
make the soil rich; keep the air, soil, water and crops free of chemicals
cannot meet the need
still a long way to find a suitable solution
Fill in the table according to the passage
【完美成篇】
In terms of the development of modern agriculture, chemical agriculture and organic agriculture are two key words, over which there are various opinions.
　　It is obvious that using chemical fertilisers has many disadvantages. Above all, there is no doubt that the chemicals staying inside the crops can lead to cancer or other illnesses. Besides, the vegetables grow so fast that they contain little nutrition.
　　Organic foods are becoming increasingly popular with customers. There are many reasons for this. The first one is that as people are richer, they attach great importance to health. Secondly, organic produce simply uses natural fertilisers, making vegetables and fruit tasty and nutritive. Moreover, the produce grows in clean water and never uses pesticides, which is beneficial for our health.
As a saying goes, health is the first wealth, so it is wiser to choose organic food.
Post-reading:
Reread the passage and fill in the blanks.
　　With the development of society, chemical pesticides and artificial fertilisers
have been in (1)__________ use in farming for many years. They can help fight
crop (2)_______ and increase production. However, they can cause many problems
(3) ______. For instance, pesticides can kill (4)_______ bacteria and insects and crops grown with chemical fertilisers usually grow (5) _______to be full of nutrition. As a result, many people worry they may make them ill and even cause cancer.
widespread
disease
as well
helpful
too fast
To tackle this problem, farmers use natural waste as (6) ________ and they often
change the kind of crop grown in each field every year and they also plant diverse
crops that use different (7)______ of soil to help keep it rich. But organic farming is
nowhere near able to (8)_____ the high demand for food. Therefore, there is still a
long way to find a (9)_______ solution that puts sufficient food on the dinner table
while keeping people and the environment as (10)_______ as possible.
fertiliser
depths
meet
suitable
healthy
Ⅱ.概要寫作
(根據教材語篇內容寫一篇60詞左右的內容概要)
參考范文
Though chemical pesticides and artificial fertilisers have been used widely in the world,(要點1)scientists found using them for long can harm the land and people’s health as well.(要點2) To solve the problem,organic farming comes into being.(要點3) However,organic farming can’t meet the high demand for food around the world,so a suitable solution will have to be found.(要點4)
Post-reading:
發表議論就是通過議論或說理來表達作者的見解和主張，作者對某一問題持有一種看法，為了使讀者同意自己的看法，提出若干理由，試圖說服別人。
發表議論時，我們要注意三個要素：論點、論據、論證。
Write an argumentative essay giving your opinion on chemical or organic farming.
Writing:
Writing:
明確體裁話題
確定時態人稱
布局文章架構
列出核心要點
Write an argumentative essay.
開頭：介紹農業發展概況和有機農業的出現。
展開論述：分層次介紹化學農業和有機農業的區別，有機農業的優勢。
結尾：總結觀點，提出建議。
支持有機農業
文體：議論文
以現在時為主、兼顧過去時、將來時；第一、三人稱
1.化學農業的缺點。
2.有機農業的優點，人們對健康的重視和選擇有機農業的理由。
Is the author of the passage for or against organic farming How do you know
What other disadvantages of chemical farming did the author not list
How might the following items be problems and how important are they for organic farming
What other disadvantages of organic farming can you think of
1. Discuss these questions in groups.
writing:
writing:
2. Decide whether your group supports chemical farming or organic farming.
Opinion
Body
* argument /topic sentence
* supporting details
Rephrase the opinion
1. Use your outline to write a short essay giving your opinion on the topic.
2. Polish your drafts and share with your partners.

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