book4unit2usinglanguage reading(H)知识讲稿.ppt

Unit 2 Using languageReading What is the matter we put on the soil which makes crops grow ? It is fertilizer. chemical fertilizers natural fertilizers 1. Why many farmers welcomed chemical fertilizers? 2. What is organic farming? 3. What is the goal of using organic farming methods? . 1.Why many farmers welcomed chemical fertilizers? Many farmers welcomed them as a great way to stop crop disease and increase production. 2.What is organic farming? Farming without using chemicals. 3.What is the goal of using organic farming methods? To grow good food and avoid damaging the environment or people’s health. Task1: Skim and match the main idea of each  paragraph. B. Long-term use of chemical fertilizers can harm the land and people’s health. D. Farmers and customers turn to organic farming. C. Organic farming methods to keep the soil fertile. A. Problems caused by chemical fertilizers. P1. P2. P3. P4. Task2: Read Para. 2 and fill the form. The disadvantages of Chemical Farming How Damaging the _______: Killing the helpful ________________ 2. Damaging _____________: 1. Many chemicals in the food supply can lead to ______ or______________. 2. Food grows too fast to be full of much ________. bacteria and pests nutrition land people’s health cancer other illnesses Read Para. 4 and find out: ①The topic sentence. ②3 more methods of organic farming to keep the soil more fertile? 1:Changing the kind of crop in each field every few years. 2:Using different levels of soil. 3:Planting grass between crops and leave it in the ground. Changing the kind of crop in each field every few years. 2.To renew the minerals in the soil and help it become rich. Planting grass between crops and leave it in the ground 1.To prevent wind or water from carrying away soil and act as a natural fertilizer. Methods