高中英语Unit 2 Working the land-The Third Period Extensive Reading教案 新课标 人教版 必修4

Unit 2 Working the land-The Third Period Extensive ReadingTeaching language 1.Target language A 重点词语 mineral , reduce , organic , level , whatever , bacteria , refer to , year after year B 重点句型 It also refers to crops growing with natural rather than chemical fertilizers. P13Putting this in their fields, they argue, makes the soil P13This is importing because developing a healthy soil reduces diseases P13However, using chemical fertilizers is a big problem. P13 Firstly , leaving chemicals in the ground a long time is not good for P13Instead, organic farmers insist on changing crop every two or three years. P14These put the minerals back into the soil, making it rich and healthy P14make sure that what is left in the ground after harvesting becomes a P142.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 students learn how to enlarge the words and know the ways of the same topic.A.Teaching important and difficult points 1 How to grasp the main idea of the passage.2 How to grasp the words and phrases and be able to use them of the same topic. B.Teaching methods Show questions, read fast, find the main idea carefully and finish all the tasks.C.Teaching aids A recorder and a projector.D.Teaching procedures & ways Step I Greeting Step II Reading There are three tasks in this. Teachers can ask students to read the articles one paragraph by one paragraph. Ask them some questions about the passages. There are three paragraph 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. 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 disvangtage of using chemical fertilizers?4. whats the main idea of paragraph 3?5. why do farmers grow their crops in such ways?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. whats the main idea of paragraph3?5. why do farmers grow their crops in such ways? Read the text one paragraph by one paragraph and answer the questions.Task 2: Structure of the text Look at the screen. This is the structure of the text. Read it and retell the text according This is the structure of the text. Read it and text according to it. Organic FarmingI Crops growing with natural fertilizersII Farmers prefer natural waste from animalsNatural fertilizer Chemical fertilizer1 make richer and 1 leaving is not good more fertili2 reduce and help strong 2 grow year after year3 the fertilizers kill from chemicalsIII Farmers change crops every twe or three years. to make sure what is left Give students some time to retell the text by themselves.if time permits, teacher can ask some of them to read out his or her passage. Task 3: Exercises on Page 14Because some of the exercises have been involved in Step II, teachers can leave this part to students.For Exercise 3, here is a simple:Organic farming means crops growing with natural fertilizers instead of chemical ones. Yhe natural fertilizer which is natural waste from animals does good to soil. It makes the soil richer in minerals while chemical fertilizers damage the soil, leaving chemicals fertilizers in the ground for a long time and killing both helpful and harmful bacteria and pests. Organic farmers keep the soil rich and healthy by changing plants every two or three years, planting different crops in different layers and planting grass between crops to prevent wind or water from carrying away the soil.Step III Listening and Language points 1. Listen to the text carefully and pay attention to meanings of the bold words and try to grasp the main idea of each paragraph. 2. Check the meanings of the bold words.“refer to” means “mean”. “minerals” means “substances that bodies needs in slight amount”. “Reduce” means “make smaller in number ”.“Supply” means “something provided “bacteria” and “poests” mean “microscopic organisms that exist in large number in air, water and soil and insects or animals that destroy plants”. “level” means “layer”. “whatever” means “no matter what” .3. Do some explanations about some important words and phrases. Show the following sentences on the screen:1. reduce V make sth smaller in size, number, degree, price, etce.g.This company tries to increase profits by reducing costs.We have reduced expenses this year.2. supply V give sb sth that is needed or usefule.g.He kept me well supplied with cups of coffee while I wrote the report.The shop was unable to supply what she wanted.In Britain milk is supplied to each house in bottles.3. whatever pron any or every(thing)e.g.we will be grateful for whatever amount you cab afford.Whatever I have is yours.4. refer to V mention or speak of sb/ste.g.When I said some people are stupid, I wasnt referring to you.Dont refer to this mater again.5. year after yeare.g. The villagers plant trees on the hill year after yearStep IV Further readingTranslate the sentences and pay attention to the boldfaced parts of each sentence. 1. It also refers to crops growing with natural rather than chemical fertilizers. P132. Putting this in their fields, they argue, makes the soil P133. This is important because developing a healthy soil reduces diseases . P134. However, using chemical fertilizers is a big problem. P135. Firstly, leaving chemicals in the ground for as long time is not food for P136. Instead,