M4U2-chemical-or-organic-farmingPPT学习课件.ppt

,LOGO,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,单击此处编辑母版标题样式,Unit 2 Working the Land,Chemical or Organic Farming?,By Sky Wang,1,In this unit we have learnt about a great man,do you still remember,who he is,?,Step.Leading-in,2,Yuan Longping,-,Father of Hybrid Rice,3,Super hybrid rice,What is his,achievement,?,4,Can you think of other ways to increase our crop harvest?,What makes crops grow faster&better?,Step,.Brainstorm,5,It is,fertilizer.,6,fertilizer,How many kinds of fertilizers do you know?,There are,two,kinds.,chemical,fertilizers,natural,fertilizers,7,chemical farming organic farming,chemical,fertilizers,natural,fertilizers,Better,？,8,Chemical or organic farming?,P14.,Step,.Reading,9,Read the passage quickly and try to find out the,main idea,of the each paragraph.,*Pay attention to the,key word(s),in each paragraph.,Task 1.Skimming,10,D.Long-term use of,chemical,fertilizers,can cause damage to the land and,peoples health.,C.,Problems,caused by chemical fertilizers.,P1,.,P2,.,B.Farmers and customers turn to,organic,farming.,A.Other,methods,to keep the soil fertile.,P3.,P4,.,M,ain idea of the each paragraph.,11,Chemical fertilizers,can cause many,problems,so,organic farming,is,becoming more popular.Organic,farming,means growing,crops with,natural fertilizer.The organic,farmers keep the soil rich and healthy.,The main idea of the text:,12,Task 2.Careful reading,Listen to the tape and pay attention,to the,pronunciation.,2.Underline the useful and important,words and expressions.,13,1.Which statement is WRONG,according,to the text,?,A.All crops are organic.,B.Recently,the term“organic farming”,has gained another meaning.,C.All farmers use fertilizers.,D.Scientists believe some chemical,fertilizers are better for people.,D,2.1.Choose the best answer.,14,2.Which is NOT the reason why organic,farmers prefer natural waste from,animals?,A.It can keep the food free from,chemicals.,B.It can keep the air,soil and water,free from chemicals.,C.It can kill harmful pests.,D.It can make the soil richer in,mineral.,C,15,3.What is the advantage of using chemical,fertilizers?,A.Leaving chemicals in the ground,for a long time is good for water supply.,B.They can get the soil exhausted.,C.They can kill helpful bacteria.,D.They can kill harmful pest.,D,16,4.The organic farmers do the followings,except _.,A.adding fertilizers which is rich in mineral,B.changing crops every two or three years,C.planting seeds in different layers of the soil,D.planting grass between crops to prevent,the soil from being blown away,A,17,1.Why are chemical fertilizers so popular in farming today?,2.What problems can be caused by using,chemical fertilizers?,3.What is organic farming?,4.What is the main reason for using organic farming methods?,2.2.Answer the following questions,.(P14.Ex.1),18,Why are chemical fertilizers,so,popular,in farming today?,They are a great way to,stop crop disease,and,increase production.,19,2.What,problems,can be caused by using,chemical fertilizers?,They can,damage the land,by killing helpful bacteria and pets and by staying in the ground and underground,water,for a long time.They,damage peoples health,by building up in their bodies and leading to cancer or other illnesses.,20,3.What is organic farming?,Organic farming,means growing,crops,without using any chemicals,.,21,The main reason for using organic farming methods is to,grow good food,and to,avoid damaging the environment or peoples health,.,4.What is the main reason for using,organic farming methods?,22,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.,chemical,bodies,problems,health,stay,Fill in the blanks according to the passage.,Step,.Retelling&Summary,23,_ farming is becoming more popular with some farmers and many _ after these discoveries came out.Organic farming does not use any chemicals.,There are many organic farming_ for making the land healthy and productive.All of these methods try to produce good food and to keep the _and people _.,methods,healthy,environment,customers,Organic,24,Step.Homework,Read the passage more carefully after class,and find some,useful language points,.,Finish the exercises on workbook,P4950,.,25,Thank You!,26,killing the helpful bacteria and pests as,well as the harmful ones.,as well as“(,除,.,之外,),也，又,”,可连接并列的单词或短语,He grows flowers,as well as,vegetables.,A teacher should entertain,as well as,teach.,It is unpleasant in summer,as well as,in winter.,Language points,27,as well as=not onlybut also,，,但两者在用法上有如下不同,not onlybut also,侧重后者,，,as well as,则着重前者，也就是说,A as well as B=not only B but also A,。,例如：,Mr.Brown has experience as well as knowledge.,布朗先生不仅有知识而且有经验。（侧重前者，即,experience,。,）,Mr Brown has not only knowledge but also experience.,）（着重后者，即,but also,后面的部分。）,28,2.Many of these chemicals can lead to cancer,or other illnesses.,lead to,导致；造成,(to,是介词，后 接名词或动词,-ing,形式,),Too much work and too little rest often,lead to,illness.,Heart failure led to her fathers death.,lead to(,道路,),通向；通往,The street leads to the supermarket.,29,turn to,求助于，转向,3.many customers are beginning to turn to,organic farming.,I tried to stand on my own two feet rather than,turned to,my parents.,We can turn to him for help.,turn on,打开，开启,turn off,关掉,turn down,调小,turn up,调大,turn against sb/sth,转而讨厌、反对某人某事,turn out to be,最后结果，最终成为,turn into sth,使,.,变成,turn in,交还，交回,turn back,掉转头,turn over,翻转,30,4.This also keeps the air,soil,water and crops,free from chemicals.,keep free from/of,使,免受,(,影响、伤害等,),We put our books in the bookcase to keep them free from dust.,keep oneself from doing sth.,克制自己不做某事,She could hardly keep herself from laughing.,keep sth.from sb.,不将某事告诉某人,I think we ought to keep the truth from him until hes better.,31,