chemical-or-organic-farming-教案.doc

Chemical or Organic Farming? (Reading)
Teaching aims:
1． Develop students reading skills by skimming for main ideas and scanning for details.
2． Have students learn and talk about disadvantages of chemical farming and advantages of organic farming.
3． Master some key words and phrases: chemical, organic, build up, lead to, keep…free from, focus on, production, cause damage to.
Important and different teaching points:
1. Enable students to learn to use strategies such as skimming, scanning, and so on to do their reading.
2. To understand the main ideas by grasping some important information.
Teaching aids:
A multimedia project, colour chalks, text, workbook.
Teaching procedure:
Step Ⅰ. Lead in
1. Self introduction: Good morning, students, my name is Li Ou, you can call me Mrs. Li or Teacher Li. Hope we can have a good time in this class. Today, we are going to learn more about unit 2 – working the land.
2. Ask student:
① Do you play QQ farming? Do you know how to play it?
Answers: First, we need to buy or select the seeds from the store.
Second, we need to plow or turn over the soil.
Third, we sow the seeds in the soil.
Finally, we can harvest our grain.
② In order to increase production of the crops, we need to water the crop, rid the soil of the weed, and kill off the pest.
Tips: increase production – reduce production – unproductive
T: Sometimes, we also use this one to fertilize the soil. What is it?
S: It is fertilizer.
T: How many kinds of fertilizers do you know?
S: There are two kinds. They are chemical＆natural fertilizers.
Step Ⅱ. Presentation
It is chemical farming by using chemical fertilizers and it is organic farming by using natural fertilizers. Which one is better, chemical or organic farming?
Today we’ll know it after learning the reading, open the book and turn to page14.
Step Ⅲ. Reading
1. Skimming
Skim to find the main idea for each paragraph.
Para1. Effects of chemical fertilizer
Para2. Problems caused by chemical fertilizers.
Para3. Farmers and customers turn to organic farming.
Para4. Other methods to keep the soil fertile.
2. Scanning
1. Why are chemical fertilizers so popular in farming today? B ( Para1 )
A. Because they are expensive.
B. They are a great way to stop crop disease and increase production.
C. They can cause damage to the land.
D. They are benefit for people’s health.
2. What problems can be cause by using chemical fertilizers? ( Para2 )
Answer: First, they can damage_ the land by killing_ the helpful bacteria and pests. They also _stay_ in the ground, build up_ in people’s bodies and _lead to_ cancer or other illnesses. In addition, it usually grows too fast to be full of nutrition.
Tips: build up – ① A new government takes time to build up.
② Taking exercise helps us build up our body.
Lead to -- ① All roads lead to Rome. 
② hard work is the main way which leads to success.
3. read Para3＆Para4
① What is organic farming?
Answer: Organic farming is farming without using any chemicals.
② What are the advantages of organic farming?
Answer: The farmers focus on keeping their soil rich, reducing disease and keeping the air, soil, water and crops free from chemicals.
Tips: focus on: You should stop focusing on playing computers and you really had to focus on your study.
keep … free from: Exercise can keep us free from disease.
The United Nation is trying to keep the world free from the threat of war.
③ What are the methods to keep the soil fertile?
l using natural waste from animals as fertilizer.
l changing the kind of crop in each field .
l planting crops to use different levels of soil.
l planting grass between crops to prevent …
Step Ⅳ. Summery
Focus on; lead to; problem; keep… free from; method; organic; chemical; cause damage to; build up; discovery

In recent days, scientists have discovered that using ________ fertilizers for a long time can _________________ the land and also people's health. There are several __________ caused by chemical fertilizers. They damage the land, stay in the water for a long time which can ___________ in people’s bodies and ____________ many illnesses. With these ___________, ________ farming is becoming more popular with some farmers. They don’t use any chemicals and _________ keeping the soil rich. This also __________ the air and crops ___________ chemicals. There are many organic farming _________ for making the land healthy and productive. All of these methods try to produce good food and to keep the environment and people’s health.
Answers: chemical; cause damage to; problems; build up; lead to; organic; focus on; keep…free from; methods
Step Ⅴ. Writing -- Plastic or Cloth bags?
The following words may help you.
Over the past half century, … have become very common …. …welcomed them as a … way to … Recently, however, we have been finding that they can cause damage to …, even …, to people’s health.
What are some of the problems caused by …? First, …, they also…. In addition, …
With these discoveries, …are beginning to turn to …
….
Step Ⅵ. Homework
1. Read the passage more carefully after class, and underline some useful language points.
2. Finish the writing
Step Ⅶ. The design of the blackboard.
Chemical or organic farming?
Chemical farming: Para1.effects: 1.stop disease
2. increase production
Para2 Problems: 1. first
2. also
3. in addition
Organic farming: Para3 Advantages: 1.without chemicals
2. keep the soil rich
3. reduce disease
4. keep … free from chemicals
Para4 Methods: 1. use natural waste
2. change crops
3. plant crops in different layers
4. plant grass between crops