资源简介

(共26张PPT)
Using Language
Evaluate chemical farming
and organic farming
Which tomatoes do you prefer Why
Chemical tomatoes
Organic tomatoes
Leading in
What do farmers do to boost yields
kill off the pest
water the crop
rid the soil of the weed
Leading in
spray pesticides
use artificial fertilisers
use organic fertilizers
Which one is organic farming
×
×
√
Leading in
What is the text about
Chemical farming
versus organic farming
(definition, benefit , problem... )
Prediction
Thinking
1.What’s chemical farming What’s organic farming
2.Read the passage and complete Task1 and Task 2 on page 56.
3.Summarize the transitional words.
4.Analyze the structure of the passage.
Discussion
1.What’s chemical farming What’s organic farming
2.Read the passage and complete Task1 and Task 2 on page 56.
3.Summarize the transitional words.
4.Analyze the structure of the passage.
1. What’s chemical farming
2. What’s organic farming
Para.1
Chemical farming is farming using chemical pesticides and artificial fertilizers.
Para.3
Presentation
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.
2. What concerns many people about the use of pesticides
Their long-term use can sometimes harm both the land and people’s health.
Para.1
3. What is one problem with the use of chemical fertilisers
Crops grown with them usually grow too fast to be rich in nutrition.
Para.2
4. How is organic farming different from chemical farming
Organic farming is simply farming without using any chemicals. Organic farmers focus on keeping their soil rich and free of diseases
through natural means.
Para.3
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.
Para.4
6. What is the goal of using organic farming methods
Do you think it can be reached Why or why not
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
part main idea Detail
1-2 Pesticide 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.
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 .
D
A
C
B
bacteria and insects
prohibited
damage they cause
grow too fast
nutrition
natural waste from animals
change the kind of crop
demand for food around the world
different depths
every year
Presentation
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
Presentation
Presentation
Presentation





however, but, on the contrary, instead, on one hand … on the other hand
for example, for instance, in fact, such as, take … for example
both…and…, not only…but also, in addition, and, also, as well, what’s more, besides, furthermore, moreover, what’s worse
why…is because…, therefore, for this reason, thus, consequently, as a ressult
as for, as an alternative
contrast
illustrate
add
cause and effect
introduce a new topic
Presentation
What’s the author’s attitude towards chemical farming and organic farming
A.Negative B. ambiguous
C. objective D. supportive
What ’s your opinion on chemical or organic farming
Let’s write an argumentative passage about it.
Presentation
Writing
1.Structure of an argumentative essay:
(Para.1)
(Para.2)
An argumentative essay
Your opinion
Supporting point2
(Para.3)
Supporting point3
Supporting point1
Introduction
Body
Conclusion
Summary
Title
Details
Details
Details
Para.1 state your opinion
Currently, there is a widespread concern over the issue that…
As is often the case, … As far as I am concerned, however, …
It can be said with certainty that ... So in my opinion, …
Nowadays, it has to be noticed that… So I’m convinced that…
2.Useful expressions for writing an argumentative essay:
Para.2 supporting points and details
First of all, there is no denying/doubt that...
On the one hand, … On the other hand, …
Moreover, …. For one thing, … For another,…
Lastly,… A case in point is ...
Similarly, we should pay more attention to...
As has been mentioned above, ...
Personally, I will conclude by saying...
Therefore, I have the reason to believe that...
From what has been discussed above, we may safely draw the conclusion that…
Para.3 give summary
Decide whether your group supports chemical arming or organic e up with three main points to support your opinion, and then add at least one detail to support each main plete the outline below.
Topic sentence: In my opinion, farming is preferable to . farming because .
Point 1: .
(Detail) . Point 2: .
(Detail) .
(Detail) . Point 3: .Conclusion: . . .
Use your outline to write a short essay giving your opinion on the topic. You can use the expressions on Page 55 when sharing your opinion.
Advantages of Organic Farming
Compared to chemical farming, organic farming enjoys its overwhelming superiority. The reasons are as follows.
Firstly, organic food is healthier and safer as in organic farming, poisonous chemicals like pesticides are forbidden from being used on crops. Furthermore, organic farming is environmentally friendly. For instance, organic farmers use natural waste from animals as fertilizer, which is harmless to the environment. Lastly, farmers can increase their income through organic farming. As people tend to pursue a green life, they are more likely to buy organic fruit and vegetables despite the high prices.
With incomparable advantages, therefore, organic farming is expected to benefit more people in the future.
Sample
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 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(真地、确实) 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(打了折扣的) 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.

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