Unit 5 Working the Land Reading for Writing 课件(共39张PPT)-2025-2026学年高二英语人教版选择性必修第一册

(共39张PPT)
Unit5 Working the Land
Chemical Versus Organic Farming
Learning Objectives
By the end of this class, you will be able to:
1.work out the content, structure and language features of the text；
2.write your opinion in an essay about chemical farming or organic farming.
Pre-reading: Make a prediction
Look at the picture on the left and the title of this passage, predict what will this text talk about
Lead in
Read the text and check whether you prediction is right or not.
Chemical Versus Organic Farming
While reading: Read for structure
Conclusion
Title
Part 1:
(Para 1&2)
Part 2:
(Para 3&4)
Part 3:
(Para 5)
Text type:
Exposition
While-reading: Read for main idea
Paragraph 1-2
D The problems with chemical farming
Main idea：
Pesticides can kill helpful bacteria and insects.
Some pesticides have been prohibited because of the damage they cause.
Crops grown with chemical fertilizers usually grow too fast to be full of nutrition.
detail
Paragraph 3
Main idea：
A What organic farming is
Many organic farmers use natural waste from animals as fertiliser.
detail
Paragraph 4
Main idea：
detail
C Organic methods for producing rich soil
They often change the kind of crop grown in each field every year.
They also plant crops that use different depths of the soil to help keep it rich.
Paragraph 5
Main idea：
B Why man-made chemicals are still used in farming
Organic farming is nowhere near[几乎不，远非] able to meet the high demand for food around the world.
detail
Careful reading:
Read Para.1 and answer:
1. Why did many farmers welcome the introduction of chemical farming
[para1. line 2] many farmers welcomed them as a great way to fight crop disease and increase production.
2. What concerns many people about the use of pesticides
[para1. line 4] Its use can sometimes harm both the land and people’s health.
Fill in the table: What chemical farming is
popularity in ____________use in farming;
many farmers __________them as a great way to....
benefits ___________crop disease and ____________production
problems _____________both the land and people’s health
widespread
welcomed
fight
increase
harm
Read Para.2 and answer:
What is one problem with the use of chemical fertilisers
[para2. line 11-12] As for chemical fertilizers, crops grown with them usually....
Fill in the table: Examples of the harm
pesticides [杀虫剂] the land
people’s health affect the crops
in turn , affect who digest them
make people ill and even cause cancer
response have been ____________in most countries
Chemical fertilizers [化肥] crops be ___________ in nutrition
look beautiful
more water than essential minerals
less favour
not only .... but also....
prohibited
poor
crops
not taste delicious
Para 3: What organic farming is
definition
an alternative
without using ang chemicals
through natural means
benefits
make the soil richer in minerals[矿物质].
keep.... free of chemicals
How is organic farming different from chemical farming
Para 4
Why do organic farmers change the kind of crop grown in a field every year
[Para 4. Line5-6]Different crops are grown because they put important minerals back into the ground，making it ready for the next batch of crops.
What is the goal of using organic farming methods
[Para 4. Line10-12]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： Organic methods for producing rich soil
goals grow good food method 1 change the kind of crop
value put important minerals back;
make it ready for the next batch of crops
avoid damage method 2 plant ___________ crops
value use different depths of soil;
keep soil rich
diverse
Para 5: Why man-made chemicals are still used in farming
preference stop the use of man-made chemicals
worries chemical farming serves the high demand for food
organic farming is nowhere near able to meet the need
solution a long way to find a suitable solution to provide sufficient food and keep people and environment as healthy as possible
Read for features
Signposts
衔接词
Introduce two contrasting points or facts: on the one hand…; on the other hand…;
Add more information: moreover…;
Explain or support a point: for example…;
State a conclusion: hence...;
Say something that contrasts with what has just been said: nevertheless...;
Give your own opinion: personally…;
Signposts in Para 1
Chemical pesticides and artificial fertilizers 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.
Signposts in Para 2
For example, pesticides can damage… but also helpful ones. In addition, these chemicals … for a long time. This affects the crops … and, in turn, the animals and humans who digest them... In fact, some pesticides like DDT … As for chemical fertilizers, … They may look beautiful on the outside, but inside … and they often have less flavour as well.
Signposts in Para 3
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. … For example, many organic farmers use natural waste from animals as fertilizer. This makes the soil in their fields richer in minerals. It also keeps the air, soil, water and crops free of chemicals.
Signposts in Para 4:
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 … Organic farmers also plant diverse crops that use different depths of soil to help keep it rich. For example, peanuts …
Signposts in Para 5:
Some people … 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.
Signposts
1. Add more information:
…, but also… ; …, and …as well;
In addition, …; also; Moreover…
2. Explain or support a point:
For example, …; For instance, …
3. State a conclusion: Therefore, …; Hence...
Signposts
4. Say something that contrasts with what has just been said:
…, but…; …, however, …; nevertheless...
5. Sequencing: In turn, …
6. Emphasizing: In fact, …
7. Introducing a new topic/thing:
As for…; As an alternative, …
Post reading
1. Is the author of the passage for or against organic farming How do you know
2. What other disadvantages of organic farming can you think of
higher cost of producing food
greater effort required to farming
…
课文语法填空
　　Chemical pesticides and artificial fertilisers have been 1 　　　　　 widespread use in farming since the middle of the 20th century，but scientists have found that their long-term use can sometimes harm both the land 2 　　　　　 people’s health. Some pesticides like DDT have been prohibited in most countries because of the damage they cause to people and the environment.
　　3 　　　　　（ solve） the problem，some farmers have switched 4 　　　　-organic farming. They use natural waste from animals as fertiliser instead of artificial fertilisers. By doing so，they make the soil in their fields 5 　　　　　（rich） in minerals than before. Many other 6______ 　　　　　__（method） are also used to produce rich soil. Farmers often change the kind of crop 7______________ 　　　　　（ grow） in each field every year. In this way，some important minerals
8 　　　　　（put） back into the ground. Some people would prefer to stop the use of man-made chemicals in agriculture 9 　____　-（entire），but organic farming can’t serve the high demand for food around the world. So scientists have to find 10 suitable solution to the problem.
in
and
To solve
to
richer
methods
grown
are put
entirely
a
Write an essay showing whether you support chemical farming or organic plete the outline first.(P57)
Topic sentence: In my opinion, _____farming is preferable to _____ farming because________.
Point 1: _________________________
(Detail ) _________________________
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. … 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, …
Argument 1 (Topic sentence)
Supporting details/evidence
Summary
Opinion
Body
* argument /topic sentence
* supporting details
Rephrase the opinion
Sample writing
In my opinion，organic farming is preferable to chemical farming because of the benefits to the environment and to people，and because organic food is more nutritious.
To begin with，chemical farming harms the environment. Since chemical pesticides are not found in nature，normal natural processes cannot get rid of them. Instead， the chemicals tend to accumulate in the soil and water，and are absorbed in the food chain，where they poison wildlife and domestic animals.
This affects us directly，because we end up eating plants，dairy products，eggs，and meat that have high levels of pesticides. Think about it：The purpose of the pesticides is to kill “pests”，that is，to kill insects. Something that can kill an insect probably is not healthy for a person to eat. While it may be true that the food we eat does not have enough pesticide in it to kill us immediately，over the years this pesticide may cause us health problems or give us diseases such as cancer.
Finally，organic food is generally more nutritious than food grown with man-made chemicals. If you remember a few years ago，there was the case of watermelons literally exploding in the fields because they had been given chemicals to make them grow faster. The reason why they exploded was that they contained too much water，because the farmers had used too many chemicals and the weather was unusually wet. As it turns out，such chemicals are commonly used in farming to grow larger crops more quickly. Do you really want to eat watered-down fruit and vegetables which have been rushed to market They cannot possibly taste as good as organic vegetables，nor can they be as nutritious.
In closing，I would like to suggest buying organic food. Yes，the price is a little higher，but the small price we pay extra will bring us huge rewards in the end.
Chunks[词块] in the text
1. alleviate world hunger 　　　　　　　*
2. at the start of 　　　　　　　　　　 *
3. listen out for sth. 　　　　　　　　　　 *
4. be in（widespread）use 　　　　　　　　　　 *
5. 　　　　 　　　　 随着时间的推移；久而久之
6. underground water sources 　　　　　　　　 *
7. 　　　　 　　　　 相应地；转而；依次；轮流
　　　　　 return 作为回报
8. cause damage 　　　　　 sb./sth. 对某人/ 某物造成损害
9. 　　　　　 for 至于，关于
10. be rich 　　　　　 富含……
缓解世界饥饿
在...的开头
留心听（某种声音）
在（广泛）应用中
over time
地下水源
in turn
in
to
as
in
Chunks[词块] in the text
11. be essential 　　 　 　　 sth. 对某物来说极其重要
It is essential 　　　　　 sth. 做某事是完全有必要的。
12. 　　　　　 well 也，又，同样（作状语）
13. have no alternative/choice but 　　　　　 sth. 除了做某事之外别无选择
14. switch 　　　　　 ... 转向……
15. focus 　　 　　　 关注，聚焦于
16. keep...free of/from 　　　 　　　　　 *
17. 　　　　　　　　 例如；比如
18. at a depth of 　 　　　　　　　 *
　　　　　 depth 全面；深入；详细
19. the root/cause of the problem 　　 　　　　　　 *
to/for
to do
as
to do
to
on
使…… 免受…… 伤害（或影响等）
for instance
在....的深处
in
问题的根源
20. put down roots 　　　　　　　　 *
21. would prefer to do sth. 　 　 　　　　　　 *
22. serve the high demand for... 　　　　　　　　 *
23. nowhere near 　　　　　　　　 *
e up 　　　　　 提出（想法、观点等）
25. 　 　　 　　　　　 至少
26. exchange sth. 　　　　　 sb. 与某人交换某物
扎根
宁愿做某事
满足对....的高需求
完全没有；远不及
with
at least
with
Chunks[词块] in the text
Assignment
1. Recite the sample writings.
2.Write your own argumentative essay giving opinion on chemical or organic farming. (Optional)
3. Project — make a poster of your favorable dish, from field to plate. (Optional)