必修4 Unit2 Chemical or organic farming(上课)PPT精品文档

1、.1.2我爱记单词我爱记单词chemicalproductionbacteriapestnutritionmineraldiscoveryadj. 化学的化学的; 关于化学的关于化学的n. 生产生产; 制造制造n. 细菌细菌n. 害虫害虫; 害兽害兽; 害鸟害鸟n. 营养营养; 滋养滋养; 食物食物n. 矿物矿物; 矿石矿石n. 发现发现; 发觉发觉.3focussoilreducerootskim underlinesummarycommentn. 焦点焦点; 中心点中心点vt. 集中集中; 聚焦聚焦n. 土壤土壤vt. 减少减少; 减缩减缩n. 根根; 根源根源vt. 浏览浏览; 略读略读

2、vt. 画底线标出画底线标出; 强调强调n. 总结总结; 摘要摘要; 概要概要n. 评论评论; 议论议论vi.& vt. 表达意见表达意见; 做出评论做出评论.4 Expressions preview build up lead to focus on keep free from/of逐渐增强逐渐增强; 建立建立; 开发开发导致导致; 通向通往通向通往集中集中 (注意力注意力, 精力等精力等) 于于使使免受免受(影响影响, 伤害等伤害等)；使使不含不含(有害物有害物).51. Have you ever been to the countryside?2. Do you know

3、how to work on a farm? Step 1: warming upStep 1: warming upLets go to the QQ happy farm!.6First, buy the seeds from the store.7Second, we need to plow（犁田） or turn over the soil.8Third , we sow （播种）（播种）the seeds in the soil.9Finally, we can have a harvest. .10 to improve the output of the crops ferti

4、lizer .11water the croprid the soil of the weedfertilize the soilkill off the pest to improve the output of the crop .12fertilizer How many kinds of fertilizers do farmers use?There are two kinds. They are chemical fertilizers and natural ones. .13Chemical Or Organic Farming?Reading.14Task 1 Task 1

5、Listening Listening （3mins3mins）Find out the main idea of these four paragraphs.15Long-term use of chemical fertilizers can cause damage to the land and peoples health.Problems caused by chemical fertilizers.P1.P2.Farmers and customers turn to organic farming.Other methods to keep the soil fertile.

6、P3.P4.16chemical fertilizersWhy are chemical fertilizers so common in farming today?Many farmers welcomed them as a great way to stop crop disease and increase production.Paragraph 1.172. After the long-term use of chemical fertilizers, what have scientists found?Long-term use of chemical fertilizer

7、s can cause damage to the land and , even more dangerous, to peoples health.18Paragraph 2they damage the_killing the _bacteria and pests as well as the _onesChemicals stay in the_ and _water for a _timethis affects _,_ and_fruit ,vegetables and other food growntoo _; they look so_not be full of nutr

8、ition; more _than vitamins and mineralslandhelpfulharmfulgroundundergroundlongcropsanimalshumansfastbeautifulwater.19 Paragraph31.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 natur

9、al waste from animals as fertilizers. FFT.20Paragraph 3 and 4The ways to keep the soil fertile.using natural waste from animals as fertilizerchanging the kind of crop in each fieldplanting crops to use different levels of soilplanting grass between crops to prevent wind and water from carryin

10、g away the soil.21 In recent days, scientists have discovered that using_ fertilizers for a long time can hurt the land and also peoples _. There are several _ caused by chemical fertilizers. They hurt the health of the land,_ in the water for a long time and get into peoples _ through their food. c

11、hemicalbodiesproblemshealthstay _ farming is becoming more popular. Some farmers and many _ turn to it . Organic farming does not use any chemicals. Organiccustomers.22Discussion If you are a landowner, you want to grow some kinds of crops, what will you do?.23Will you use any fertilizer to improve

12、the production? Why?.24Language Pointsbuild up 增强增强; 建立建立; 开发开发 Hard working conditions build upcharacter. Doing regular exercise can build up my health.25Many 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

13、. 3.War only leads to violence. .26 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.27 reduce v. 减少减少, 降低降低e.g. 公司尽力通过减少花销来提高利润公司尽力通过减少花销来提高利润。The company tries to increase profits by_ .今年我们已经减少了业务开支。今年我们已经减少了业务开支。We _ expenses this year. reducing costshave reduced.28This also keeps the air, soil, water and crops free from chemicals