高中英语必修四-unit2-chemical-or-organic-farming-？.ppt

* Chemical Or Organic Farming? Unit 2 Working the land Words preview 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 Step 1 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 in addition (to) 逐渐增强; 建立; 开发 导致; 造成 (后果) 集中 (注意力, 精力等) 于 使……免受(影响, 伤害等)； 使……不含(有害物) 此外 1.The government has banned(禁止) the use of ________ weapons（武器）. chemical 2. They have worked out a series of _________ plans to increase agricultural output this year. production 3.Radium(镭) is one of the greatest _________ during the nineteenth century. discoveries 4. He always _______ his mind on his lessons. focuses 5. The government should take measures to _______ envrionment polution. reduce Step 2 Fill in the blanks using the words and expressions above. 6. Read the passage and ________ the topic of each paragraph. underline 7. You’d better not ________ untill you know the facts . comment 8. We must do exercises every day to _______ our bodies. build up 9.Misunderstandings between friends may _______ quarrels. lead to 10. The students should _____ themselves ________ bad habits. keep free from Chemical Or Organic Farming? Step 3 Skim to find the topic sentence or main idea for each paragraph. Long-term use of chemical fertilizers can cause damage to the land and people’s health. Problems caused by chemical fertilizers Farmers and customers turn to organic farming. Other methods to keep the soil fertile. Para 1 Para 2 Para3 para4 Part1 Part 2 chemical farming organic farming Structure: 1. Why are chemical fertilizers so popular in farming today? Long-term use of chemical fertilizers can cause damage to the land and , even more dangerous, to people’s health. Read Para 1 and answer the follow