chemical-or-organic-farming优质课评比课件.ppt

Unit 2 Working the land,李 鸥 丽水黎明中学,First, buy or select the seeds from the store.,,Second, we need to plow（犁田） or turn over the soil.,,Third , we sow the seeds in the soil.,,Finally, we can harvest our grain.,,,fertilize the soil,to increase production of the crops,fertilizer,,fertilizer,How many kinds of fertilizers do you know?,chemical fertilizers natural fertilizers,chemical farming organic farming,chemical fertilizers natural fertilizers,,,,Better？,Chemical Or Organic Farming?,Task 1 Skimming （3mins）,Find out the main idea of these four paragraphs.,Effect of chemical fertilizer,Problems caused by chemical fertilizers.,P1.,P2.,Farmers and customers turn to organic farming. (advantages),Other methods to keep the soil fertile.,P3.,P4.,,,,,Why are chemical fertilizers so popular in farming today? Because they are cheap. They are a great way to stop crop disease and increase production. They can cause damage to the land. They are benefit for peoples health.,Task 2 Scanning,Paragraph 1,2. What problems can be caused by using chemical fertilizers?,First, they can _________ the land by _________ the helpful bacteria and pests. They also ________ in the ground, __________ in peoples bodies and ________ cancer or other illnesses. In addition, it usually grows too fast to be full of ____________.,Paragraph 2,damage,killing,stay,build up,lead to,nutrition,1. What is organic farming? 2. What are the advantages of organic farming? 3. What are the methods to keep the soil fertile?,1.Organic farming is farming without using any chemicals.,,Haha, weve turned to organic farming.,Paragraph 3&4,,2. What are the advantages of organic farming? The farmers ________ keeping their soil rich, ________ disease and _______ the air , soil, water and crops _________ chemicals.,Paragraph 3,focus on,reducing,keeping,free from,,,The methods to keep the soil fertile using natural waste from animals as fertilizer. changing the kind of crop in each field . planting crops to use different levels of soil. planting grass between crops to prevent ,The same goal : ________________________ ______________________________________ ______________________________,,to grow good food and avoid damaging the environment or peoples health.,Paragraph 3&4,1,2,3,4,,In recent days, scientists have discovered that using________ fertilizers for a long time can _________________ the land and also peoples health. There are several __________ caused by chemical fertilizers. They damage the land, stay in the water for a long time which can ___________ in peoples bodies and ____________ many illnesses.,chemical,problems,cause damage to,build up,Fill in the blanks according to the passage.,lead to,________ farming is becoming more popular with some farmers. Organic farming does not 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 peoples health.,keep,methods,focus on,Organic,free from,请以“Plastic or Cloth bags?”为题模仿这篇文章的篇章结构和句子结构去写一篇说明文。

Discussion and practice,Plastic Or Cloth Bags?,Para1: Para2: Para3: Para4:,Have a brief introduction of the present situation. (Effects) The problems caused by using plastic bags. The advantages of using cloth bags. Conclusion.,Plastic or Cloth Bags,Over the past half century, ___________ have become very common in ___________. ______ welcomed them as a _________ way to ____________. Recently, however, we have been finding that they can cause damage to ___________, even_________, to peoples health.,Plastic bags,our daily life,We,convenient,carry goods,environment,worse,Homework,,Read the text more carefully after class, and underline some useful language points. Finish the writing.,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 peoples health. What are some of the problems caused by ? First,, they also. In addition, With these discoveries, are beginning to turn to . .,Thank you for attention！,。