资源简介

(共21张PPT)
Using Language
（Reading and Writing）
Unit 5 Working the Land
Evaluate chemical farming or organic farming
Learning Objectives
Understand the differences between chemical and organic farming and their advantages and disadvantages;
Learn about the structure of an argumentative essay；
Write an argumentative essay to express our views on chemical farming or organic farming.
Lead-in
What organic means
What organic means
No chemical fertilisers or pesticides
No genetically modified organisms
Prediction
Predict by analyzing the title and observing the pictures.
1. What is the farmer in the picture doing
2.What is the farmer wearing Why
Spraying(喷洒) chemical pesticides on the crops.
A mask and a hat.
Maybe the chemical pesticides are harmful to health.
Read for the structure
Match the main idea with each paragraph.
Para 1
Para 2
Para 3
Para 4
Para 5
What organic farming is.
The problems with chemical farming.
Some examples for the disadvantages of chemical farming.
Organic methods to produce rich soil.
Why man-made chemical fertilisers are still used in farming.
Read and Think (organization )
Title
The _______ and _________ of chemical farming.
benefits
problems
Part 1:
(Para 1&2)
What organic farming is and __________________.
how it keep the soil rich
Part 2:
(Para 3&4)
Part 3:
(Para 5)
Conclusion
Q1.Why did many farmers welcome the introduction of chemical farming
Q2.What concerns many people about the use of pesticides
Q3.How is organic farming different from chemical farming
Q4.Why do organic farmers change the kind of crop grown in a field every year
(para.1)Because they see it as a great way to fight crop disease and increase production.
(para.1-2)Their long-term use can sometimes harm both the land and people's health.
(para.3)It doesn't use any chemicals.
(para.4)To produce rich soil--different crops put important minerals back into the ground, making it ready for the next batch of crops.
Read and answer questions
Read for the content -- Read and fill
Advantages
Disadvantages
Organic
Farming
fight crop disease
increase production
kill harmful bacteria and insects
crops look beautiful outside
produce richer fields
healthy food-free of chemicals
avoid damage to the environment or to people's health
......
harm the land and environment
harm people’s health-cause cancer
kill helpfel insects
crops are less in nutrition
less flavour
cannot meet the demand for food
......
Chemical
Farming
How to write an argumentative essay
Writing Task
近年来，媒体对“农业可持续发展” “食品安全”等问题作了一些报道，引发了许多讨论，化学种植和有机种植哪种有利于农业可持续发展并解决食品安全问题呢？请用英语写一篇议论文，表达自己的观点，并说明理由。
What other advantages and disadvantages of chemical and organic farming the author did not list Please add more.
advantages
disadvantages
chemical
organic
lower costs
crops look beautiful outside
ecological balance
food safety
ecological damage
food safety
risks
smelly gases
Brainstorm
more efforts and higher cost
Structure
The hot issue
P1
P2
The disadvantage(s)
The advantage(s)
P3
The writer's opinion
—— the arguments （论据）
&
supporting examples（例子）
—— the conlusion（结论）
—— the main idea
（论点）
一、正反对比式议论文结构
Ending
Beginning
Body
An argumentative essay
Topic sentence:
In my opinion, ________farming is preferable to _______ farming because____________.
Argument 1 (Topic sentence) +detail:
Point 1: To begin with, ______________.(Detail)_______.
Point 2: What’s more, _______________.(Detail)_______.
Point 3: Finally,_______________.(Detail)_______.
Conclusion:
In closing, I am fully convinced that__________________.
Structure
1. 提出讨论的话题
最近我们讨论了要不要发展有机耕作。看法因人而异。
Recently organic
farming. .
we held a discussion about whether to develop　
Opinions vary from person to person　
2. 介绍反方观点及理由
①很明显，使用化肥有很多缺点。
It is obvious that using chemical fertilisers .
②最重要的是，留在作物内部的化学物质会导致癌症或其他疾病。
Above all， the chemicals staying inside the crops
.
has many disadvantages　
can lead to cancer
or other illnesses　
3. 介绍正方观点及理由
①随着人们越来越富裕，他们非常重视健康。
As people are becoming richer，
.
②有机农产品只需使用天然肥料，使蔬菜和水果既美味又有营养。
Organic produce simply uses natural fertilisers，
and nutritive.
they attach great importance to
health　
making vegetables
and fruit tasty　
4. 介绍自己的观点
健康是第一财富，所以选择有机食品更明智。
　As the old saying goes， health is the first wealth， so it is wiser to
choose organic food.　
Writing Task
近年来，媒体对“农业可持续发展” “食品安全”等问题作了一些报道，引发了许多讨论，化学种植和有机种植哪种有利于农业可持续发展并解决食品安全问题呢？请用英语写一篇议论文，表达自己的观点，并说明理由。
Function Transitional words
Contrast
Illustrate（说明）
Add information
Cause and effect(因果)
Introduce a new topic
however, but
for example, for instance, in fact,
both…and…, not only…but also, in addition, and, also, as well,
why…is because…, therefore,
as for, as an alternative
on the contrary, instead, on one hand...on the other hand
such as, take … for example
what’s more, besides, furthermore, moreover, what’s worse
for this reason, thus, consequently, as a ressult
Useful Expressions
express your opinions: In my opinion, ....As far as I’m concerned,....
From my point of view,…I’m in favour of....I’m against/opposed to.. I firmly believe that…
make a conclusion:
In short, ....In a word,…All in all,…In conclusion,....To sum up,…
Exchange your draft with your partner
(1)Use the checklist to help you review your partner's draft.
Does the writer do a good job of expressing his/her opinion
Does each paragraph have one main idea support its main idea
Does the writer sequence the points in a logical order Are there any connectives in the essay
Does the writer use any subject clauses
Does the writer do a good job persuading you to accept his/her opinion
Does the writer use correct grammar, punctuation, and spelling
Assignment
1.Polish your own argumentative essay giving opinion on chemical or organic farming.
2. Project — make a poster of your favorable dish, from field to plate. (Optional)
Thank you!
In my opinion,organic farming is preferable to chemical farming because it has some outstanding advantages. The following are my reasons.
First of all, we should do everything in our power to protect our delicate environment. Organic farming, with no chemical fertilizers, can keep the soil rich. As a result, it’s sure that organic farming is good for the environment. With more and more people diagnosed with cancer, we should pay more attention to our food. Organic farming produces food full of minerals and vitamins, which are nutritious. The better food we eat, the less likely we are to develop disease. Lastly, all of us know that food produced in the traditional chemical way tastes bad. However, organic food is more delicious, which helps us have a good appetite.
In a word, I think organic farming is better.

展开更多......

收起↑