必修4 unit2 chemical or organic farming.ppt

Task 2 Careful Reading 2. After the long-term use of chemical fertilizers, what have scientists found? Paragraph 2 Paragraph3 1.Some farmers and many customers begin to turn to chemical farming. 2. Organic farming is simply farming without using any fertilizer. 3.Organic farmers prefer using natural waste from animals as fertilizers. Paragraph 3 and 4 Language Points build up ?增强; 建立; 开发 Hard working conditions build up character. Doing regular exercise can build up my health. Many of these chemicals can lead to cancer or other illnesses. 1.Too much work and too little rest often lead to illness.? 2.All roads lead to Rome.? 3.War only leads to violence. They focus on keeping their soil rich and free of disease. You should focus your attention on your work. We should focus our energy on our customers’ needs. This also keeps the air, soil, water and crops free from chemicals. 1.We put our books in the box to keep them free from dust. 2.You should keep the area free from pollution. Homework Discussion If you are a landowner, you want to grow some kinds of crops, what will you do? * 我爱记单词 chemical production bacteria pest nutrition mineral discovery adj. 化学的; 关于化学的 n. 生产; 制造 n. 细菌 n. 害虫; 害兽; 害鸟 n. 营养; 滋养; 食物 n. 矿物; 矿石 n. 发现; 发觉 focus soil reduce root skim underline summary comment n. 焦点; 中心点 vt. 集中; 聚焦 n. 土壤 vt. 减少; 减缩 n. 根; 根源 vt. 浏览; 略读 vt. 画底线标出; 强调 n. 总结; 摘要; 概要 n. 评论; 议论 vi. vt. 表达意见; 做出评论 Expressions preview build up lead to focus on keep… free from/of 逐渐增强; 建立; 开发 导致; 通向通往 集中 (注意力, 精力等) 于 使……免受(影响, 伤害等)； 使……不含(有害物) 1. Have you ever been to the countryside? 2. Do you k