2022年高中英語 Unit 2《Working the land》教案（4） 新人教版必修4

2022年高中英語 Unit 2Working the land教案（4） 新人教版必修4Teaching goals 教學目標1. Target language 目標語言a. 重點詞語 chemical, bacteria, pest, lead to, discovery, nutrition, keepfree from, rootb. 重點句型 With these discoveries, some farmer and many customers are beginning to turn to organic farming.Over the past half century, using chemical fertilizers has bee very mon in farming.2. Ability goals 能力目標Enable Ss to master the main idea of the text and know the ways of organizing articles.3. Learning ability goals 學能目標Help Ss learn how to enlarge the words and structures of the same topic.Teaching important and difficult points 教學重難點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 教學方法Show questions, read fast, find the main ideas, and then read carefully and finish all the tasks.Teaching aids 教學準備A recorder and a projector.Teaching procedures & ways 教學過程與方法Step Leading in Enjoy a beautiful song A quiz & Fill blanksT: Morning, boys and girls! Glad to see you! Before learning, Let us enjoy a beautiful song. What is this song about? Yes, it is about the agriculture .Agriculture can provide us with food .Can you tell me; do you have healthy food everyday? Is healthy food important to us?Ss: Yeah! Glad to see you! Yes, I think that the food we eat everyday is healthy food! I think healthy food is important to us all!(First,Let students taste some delicious food and guess what the food are?)T: Good job! Really? First, let us have a quiz. I would like some students e here to taste the food in this plate and tell us the name of the food. Remember, you need close your eyes before you taste the food.Ss: OK.T: Are they delicious? This food is green food that I brought from Super Market yesterday. Ok, boys and girls! Listen to me carefully! Everybody knows that as peoples living condition improves, more and more people are concerned about what 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. Well, How do you understand green food? Do you know the advantages of green food? Let us have a petition .Two groups, the group which can get the highest marks will be the winner, Are you clear?Ss: Advantages of green food* taste delicious*grown in clean air*free of p pollution*rich in nutrition*do good to peoples health and the environmentT：Well done! Everyone. Can you tell me which kind of farming makes green food? Chemical or Organic Farming?Ss: Organic Farming!T: Great! You did a good job! Well, let us read the text on P14 and know something about organic farming.Step Pre readingT: Before reading the text, please look at the picture first and predict what the passage about. Then have free talks on what can you see in the picture?Ss: The picture may be about agriculture. We can see green field, mountains and tall trees .we also can see some animals, such as chickens, pigs, geese, and ducks and so on. Not far away, a man is driving a tractor to plowing fields. T：Excellent! Now, before reading the passage, Let read the bold word words in the text loudly.Ss: chemical, production Step Fast ReadingT：Let us read the text first and then finish the following questions after reading the passage. You only have 3 minutes.Questions:1. Why are chemical fertilizers so popular in farming today?2. What problems can be caused by using chemical fertilizers?3. What is organic farming?4. What is the main reason for using organic farming methods?Answers:1. They are a great way to stop crop disease and increase production.2. They can damage the land by killing helpful bacteria and pests and by staying in the ground and underground water for a long time. They damage peoples health by building up in their bodies and leading to cancer or other illnesses.3. Organic farming means growing crops without using any chemicals.4. The main reason for using organic farming methods is to grow good food and to avoid damaging the environment or peoples health.T：Wonderful! Boys and girls!Step Intensive reading Find the main idea and the topic sentence of each paragraph to know the structure of this passage. According to the main idea and the topic sentence of each paragraph, let students know how to write a summary.T：Now, this time let us read the passage after the tape sentence by sentence. Please pay attention to the pronunciation and pauses of each sentence. Then find out the main idea and topic sentence of each paragraph to know the structure of this passage. Ok, lets begin.Ss: Main idea of the passageChemical fertilizers can cause many problems, so organic farming is being more popular.Structure of the textParagraph 1: using chemical fertilizers for a long time can hurt the land and also peoples healthParagraph 2: Problem caused by chemical fertilizers1. Damage the land by killing the helpful bacteria and pests as well as the harmful ones2. 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.Paragraph 3: Organic farming is being more popular with some farmers and many customers after these discoveries came out. Paragraph 4: Other methods to keep the soil fertile.Step ExplanationShow the following Practice on the screen.1. They focus on keeping their soil rich and free of disease. 考點 動詞-ing短語作介詞的賓語。考例1 Isnt it time you got down to _ the papers? (重慶xx)A. mark B. be markedC. being marked D. marking 點撥 get down to doing sth. 開始著手干某事，to在這個短語中是介詞, 后可跟動詞-ing形式、名詞或代詞。又因mark the papers“判試卷”與邏輯主語you是主動關系，故排除選項C。2.考例2 According to a recent U.S. survey, children spent up to 25 hours a week _ TV. (上海xx)A. to watchB. to watchingC. watching D. watch點撥 spend time / money (in) doing sth.花費時間或金錢干某事。doing sth. 作介詞in的賓語。3. build up 逐漸積聚; 增進，增強 Traffic on this road is building up. build up ones strength after an illness. 4. lead to 導致; 通向往 His mistakes led to his failure. This road leads to the railway station.5. keep free from “遠離”或“避免” keep free from emotional reactions 避免激動的反應 keep free from restrictions 避免受到限制 6. 1. All the rooms are _ with electric lights. (xx 上海）A. supplied B. given C. offered D. burnt Supply1) 用作名詞時：a) 指“供給;供應”等,其反義詞為demand (需求)。 supply and demand 供與求 be in short supply 供應缺乏,供應不足 food supply 食物供應 water supply 供水b) 當“供應品;生活用品;補給品”等,常用復數(shù)supplies。 military supplies 軍需品 household supplies 家庭用品 medical supplies 醫(yī)用品2) 用作動詞時,指“供給,提供,備辦”等, supply sb. (with) sth , supply sth. to /for sb. - They supplied food to/for them. 他們供給他食物。 - The library is well supplied with books. 圖書館備有充足的書籍。Step Homework1. Finish your writing of summary on P152. Review the reading materials in this Unit .3. Get more about farming.