Learning about Language公开课教案

Unit2 learning about language Teaching goals 教学目标

1. Target language 目标语言

a. 重点词语

chemical, bacteria, pest, lead to, discovery, nutrition, keep…free from, root

b. 重点句型

With these discoveries, some farmer and many customers are beginning to turn to organic farming. Over the past half century, using chemical fertilizers has become very common in farming. 2. Ability goals 能力目标

Enable Ss to master the main idea of the text and know the ways of organizing articles. 3. Learning ability goals 学能目标

Help Ss learn how to enlarge the words and structures of the same topic. Teaching important and difficult points 教学重难点

1. How to grasp the main idea of the passage. 2. How to grasp the words and phrases and be able to use them freely. Teaching methods 教学方法

Show questions, read fast, find the main ideas, and then read carefully and finish all the tasks. Teaching aids 教学准备

A recorder and a projector. Teaching procedures & ways 教学过程与方法

Step Ⅰ

Greeting and revision

T: Morning, boys and girls! Do you still remember the poem I gave you last time? Ss: Yeah! T: Who’d like to recite it to the whole class?

S1: Me. Listen! 心平何劳持戒，行直何用修禅，恩则孝养父母，义则上下相怜。让则尊卑和睦，忍则众恶无喧。若能钻木取火，淤泥定生红莲。

T：Very good! Thank you. I think knowledge is important. But wisdom is more important. If a person only knows how to invent and creat something, but doesn’t think over whether his inventions can bring people the true happiness; or he only does thing for his or his group’s interest. Moreover, sometimes what he made can do harm to society, then he will be the most dangerous person in the world. The poem above is very easy to understand. If you do things as it tells us, you can turn out to be a wise man who will bring the world the happiness.

Well, today we are going to do some reading. Please turn to Page 13. We’ll read this material first.

Step Ⅱ

Reading There are three tasks in this step. First, teacher can ask students to read the articles

one paragraph by one paragraph. Ask them some questions about these passages. There are three paragraphs in the article. In each passage, there are one or two questions. When students finish these questions, they will find that the structure of the text has turned up. T: Wonderful! Homework check is over. In the last two periods we talked about agriculture. As people’s living condition improves, more and more people are concerned about what they eat. In fact more and more people become worried about the quality of the food they eat. Because more and more farmers use chemical fertilizer instead of natural waste from animals and they use poison to kill insects to protect their plants. So people now all want to eat green food which does no harm to their health. They are more concerned about organic farming. Now let’s read the text and know something about organic farming. Task 1: Questions about the text. Show the questions on the screen:

1. What is the organic farming? 2. What is the advantage of using natural fertilizer? 3. What is the disadvantage of using chemical fertilizers? 4. What’s the main idea of paragraph 3?

5. Why do farmers grow their crops in such ways?

T: Boys and girls, today we’ll read the text one paragraph by one paragraph. Now please read the first paragraph quickly, and find the answer to the first question: what is the organic farming? S1: Organic farming refers to crops growing with natural rather than chemical fertilizers. T: Good. Now read the second paragraph quickly and find the answer to this question: what are the advantage of using natural fertilizer? S2: Make the soil richer in minerals and so more fertile. T: anything else? S3: Reduce diseases in crops and help them grow strong and healthy. Besides, keep the air, soil and water as well as the food supply free from chemical.

T: What is the disadvantage of using chemical fertilizers? S4: Let me answer it. There are three disadvantages. Firstly, leaving chemicals in the ground for a long time is not good for the soil or the water supply. Secondly, farmers often grow the same crop year after year. As a result, the soil gets exhausted. Thirdly, chemical fertilizers kill both helpful and harmful bacteria and pests.

Main idea of the passage Chemical fertilizers can cause many problems, so organic farming is becoming

more popular.

Structure of the text I using chemical fertilizers for a long time can hurt the land and also people’s health

II Problem caused by chemical fertilizers 1. Damage the land by killing the helpful bacteria and pests as well as the harmful ones 2. Lead to cancer or other illness. 3. Food grown with chemical fertilizers look beautiful, but inside there is usually more water than vitamins and minerals. Ⅲ

Organic farming is becoming more popular with some farmers and many customers after these discoveries came out.

IV Other methods to keep the soil fertile.

附件1

Is organic food safe? Yes. Organic food is as safe to consume as any other kind of food. Just as with any kind of produce, consumers should wash before consuming to ensure maximum cleanliness. As cited above, organic produce contains significantly lower levels of pesticide residues than conventional produce. It is a common misconception that organic food could be at greater risk of E. coli contamination because of raw manure application although conventional farmers commonly apply tons of raw manure as well with no regulation whatsoever. Organic standards set strict guidelines on manure use in organic farming: Either it must be first composted, or it must be applied at least 90 days before harvest, which allows ample time for microbial breakdown of any pathogens.

Why does organic cost more?

The cost of organic food is higher than that of conventional food because the organic price tag more closely reflects the true cost of growing the food: substituting labor and intensive management for chemicals, the health and environmental costs of which are borne by society. These costs include cleanup of polluted water and remediation of pesticide contamination. Prices for organic foods include costs of growing, harvesting, transportation and storage. In the case of processed foods, processing and packaging costs are also included. Organically produced foods must meet stricter regulations governing all these steps than conventional foods. The intensive management and labor used in organic production are frequently (though not always) more expensive than the chemicals routinely used on conventional farms. There is mounting evidence that if all the indirect costs of conventional food production were factored into the price of food, organic foods would cost the same, or, more likely, be cheaper than conventional food.