【精品】重庆市大学城第一中学校重庆大学版高中英语必修四课件：Unit1Using_languagePeriod4(共24张PPT)PPT

1、Unit 2 Using language Chemical or organic farming?重庆市大学城第一中学校重庆大学版高中英语必修四课件：Unit1Using_languagePeriod4(共24张PPT)Words Review chemical production bacteria pest nutrition mineral adj. 化学的；关于化学的化学的；关于化学的n. 生产；制造生产；制造n. 细菌细菌n. 害虫；害兽；害鸟害虫；害兽；害鸟n. 营养；滋养；食物营养；滋养；食物n. 矿物；矿石矿物；矿石重庆市大学城第一中学校重庆大学版高中英语必修四课件：Unit

2、1Using_languagePeriod4(共24张PPT) discovery focus soil reduce root n. 发现；发觉发现；发觉n. 焦点；中心点焦点；中心点vt. 集中；聚焦集中；聚焦n. 土壤土壤vt. 减少；减缩减少；减缩n. 根；根源根；根源Words Review重庆市大学城第一中学校重庆大学版高中英语必修四课件：Unit1Using_languagePeriod4(共24张PPT) skim underline summary comment vt. 浏览；略读浏览；略读vt. 画底线标出；强调画底线标出；强调n. 总结；摘要；概要总结；摘要；概要n.

3、评论；议论评论；议论vi.& vt. 表达意见表达意见; 做出评论做出评论Words Review重庆市大学城第一中学校重庆大学版高中英语必修四课件：Unit1Using_languagePeriod4(共24张PPT) Expressions Review 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; 造成造成 (后果后果) 集中集中 (注意力，精力等注意力，精力等) 于于使使免受免受(影响，伤害等影响，伤害等)；使使不含不含(有害物有害物)重庆市大学城第一中学校重庆大学版高中英语必修四课件：

4、Unit1Using_languagePeriod4(共24张PPT) In this unit, we have learnt about a great man, do you still remember who he is? What is his achievement? Can you think of other ways to increase our crop harvest?重庆市大学城第一中学校重庆大学版高中英语必修四课件：Unit1Using_languagePeriod4(共24张PPT)重庆市大学城第一中学校重庆大学版高中英语必修四课件：Unit1Using_lan

5、guagePeriod4(共24张PPT)fertilizer.chemical fertilizers natural fertilizers重庆市大学城第一中学校重庆大学版高中英语必修四课件：Unit1Using_languagePeriod4(共24张PPT)Chemical or organic farming?Read the passage , then find out the main idea of each paragraph.Para 1: Para 2:Para 3:Para 4: Long-term use of fertilizers can cause damag

6、e to the land and peoples health.The problem caused by chemical fertilizers .What is organic farming?The methods of organic farming. Fast reading ( 3 mins )Read the text again and answer the following questions:1. Why are chemical fertilizers so popular in farming today?2. What problems can be cause

7、d by using chemical fertilizers ?3. What is organic farming ?4. What is the advantage of using natural fertilizer? 5. What is the main reason for using organic farming methods ?Careful reading ( 7mins )1.Why are chemical fertilizers so popular in farming today ?They can stop crop disease and increas

8、e production.2 What problems can be caused by chemical fertilizers ?There are three problems. Firstly, they damage the land by killing the helpful bacteria and pests. Secondly, Chemicals staying in the ground and underground water for a long time affects crops and, therefore, animals and humans. And

9、 many of the chemicals can lead to cancer or other illnesses.Thirdly, fruit, vegetables and other food grown with chemical fertilizers usually grow too fast to be full of much nutrition.重庆市大学城第一中学校重庆大学版高中英语必修四课件：Unit1Using_languagePeriod4(共24张PPT)Organic farming is simply farming without using any_.

10、green foodchemicals重庆市大学城第一中学校重庆大学版高中英语必修四课件：Unit1Using_languagePeriod4(共24张PPT)4. What is the advantage of using natural fertilizer? * Reduce diseases in crops and help them grow strong and healthy. * Make the soil richer in minerals and so more fertile.* Besides, keep the air, soil and water as we

11、ll as the food supply free from chemicals.5 . What is the main reason for using organic farming methods ?The main reason for using organic farming methods is to grow good food and avoid damaging the environment or peoples health. Post reading ( 5mins )Read the text again, and fill in the following f

12、orms.重庆市大学城第一中学校重庆大学版高中英语必修四课件：Unit1Using_languagePeriod4(共24张PPT)Methods of organic farmingAdvantages of methods1.Farmers use natural waste from animals2.Farmers change the kind of crop in each field every few years.3.Farmers plant crops with different lengths of roots.4. Farmers plant grass betwee

13、n crops and leave it in the ground.Changing the crops renews the _in the soil and helps it become _ and _.This prevents _ or _ from _ _soil and acts as an _fertilizer.This uses different _ ofsoil.This makes the soil _in _and so more_.richermineralsfertilemineralsrichfertilelevels wind watercarrying

14、awaynatural重庆市大学城第一中学校重庆大学版高中英语必修四课件：Unit1Using_languagePeriod4(共24张PPT)Para.1 Topic Para.2 ProblemsPara.3 AdvantagesPara.4 Several methodsillustration（阐明）（阐明）comparison conclusionThe type of the article is_Exposition（说明文）（说明文）The structure of this passage重庆市大学城第一中学校重庆大学版高中英语必修四课件：Unit1Using_languag

15、ePeriod4(共24张PPT)Expressions 1.在过去的半个世纪里2.化肥3.对造成损害4.洗掉某物5.导致;造成(后果);通往6.逐渐增强,建立7.另外(还有)8.使免受(影响); 使不含(有害物)9.集中(注意力、精力)于10.每隔几年11.避免做over/in the past half centurychemical fertilizerscause/do damage towash offlead tobulid upin addition (to)keepfree from/offocus onevery few yearsavoid doing重庆市大学城第一中学校

16、重庆大学版高中英语必修四课件：Unit1Using_languagePeriod4(共24张PPT)12. put sth back into 将将带回到带回到13.use different levels of soil 利用不同层次的土壤利用不同层次的土壤14.(be) followed by 后面是后面是,后面有后面有,接着是接着是15. put down deep roots 生根于深层土壤生根于深层土壤16.carry away 带走带走,冲走冲走重庆市大学城第一中学校重庆大学版高中英语必修四课件：Unit1Using_languagePeriod4(共24张PPT)Exercises cause/do damage to, wash off, lead to, bulid up, in addition(to), keepfree from/of, focus on,avoid doingHis mistakes _ his failure.Please _ your mind_ the following problem.5. Children should _ violence.led tobulid upfocusonlead tobe kept free from重庆市大学城第一中学校重庆大学版高中英语必修四课件：U