上课好 2 Unit2__Using__language__——reading参考课件(共42张PPT).ppt

Unit2 Working the land Using language ——reading Reading CHEMICAL OR ORGANIC FARMING? Long-term use of chemical fertilizers can cause damage to the land and people’s health. Problems caused by chemical fertilizers. The main idea of each paragraph P1. P2. Farmers and customers turn to organic farming. Other methods to keep the soil fertile. P3. P4. 1. What is “organic farming”? 2. What do organic farmers prefer to use as fertilizer? 3. Why do organic farmers grow peas or soybeans after corn or wheat? 4. What is the advantage of using natural fertilizer? 5. Why are chemical fertilizers so popular in farming today? 6. What problems are caused by using chemical fertilizers? 7. What is the main reason for using organic farming methods? 1. What is “organic farming”? Answer the questions. It refers to crops growing with natural rather than chemical fertilizers. 2. What do organic farmers prefer to use as fertilizer? The fertilizer that organic farmers prefer is natural waste from animals. Farmers grow peas or soybeans after corn or wheat so that peas and beans can put minerals back into the soil, making it rich and healthy and ready to grow more wheat or corn. 3. Why do organic farmers grow peas  or soybeans after corn or wheat? 4. What is the advantage of using natural fertilizer? Make the soil richer in minerals and so more fertile. 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. They are a great way to stop crop disease and increase production. 5. Why are chemical fertilizers so popular in farming today? 6. What problems are caused by using chemical fertilizers? There are three problems. First, chemical fertilizers affect the soil and the water supply badly. Second, they allow farmers to grow the same crop year after year and exhaust the soil. Third, they kill both helpful and harmfu