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1、,Unit 5 Working the land,Evaluate chemical farming and organic farming,预习课件,essential adj. 及其重要的；完全必要的教材原句There is usually more water than essential minerals.要点必记essential information重要信息essential use必要用途essential mineral主要矿物,核心词汇,alternative n. 可供选择的事物；adj. 可供替代的,教材原句 As an alternative, some farmer
2、s have switched to organic farming.要点必记alternative method 替代的方法alternative approach 变换方法have no alternative but v. 别无选择；只得；唯一的办法是,instance n. 现实；事实,教材原句For instance, they may grow corn or wheat in a field one year.要点必记for instance 例如（for example; such as）in this instance 在此情况下at the instance of 在的请求
3、下；经的提议；因的主张,depth 轮流；依次,教材原句Organic farmers also plan diverse crops that use different depths of soil to help keep it rich.要点必记in depth 深入地；全面地in the depth of 在里面longlength widewidth highheight deepdepth,entirely v. 消化；领会,教材原句Some people would prefer to stop the use of man-made chemicals in agricult
4、ure entirely.例句Their price depended almost entirely on their scarcity.他们的价格几乎完全靠他们的供不应求。This administration is not entirely free of suspicion.这届政府并不是完全没有疑点。,not onlybut also,要点必记1. not onlybut also就近原则连接两个主语时，要和与其最近的主语保持人称和数的一致。 如： Not only Tom but also Alice and Mary are busy.不仅汤姆很忙，爱丽丝和玛丽也很忙,核心句式：
5、,为了强调，可将not only置于句首，其后的句子通常要用部分倒装的形式。如:Not only has she been late three times, she has also done no work.她不仅仅迟到了3次，她还没干一点活。,Unit 5 Working the land,Evaluate chemical farming and organic farming,Goals,Look and discussWhat is the advantages and disadvantages of chemical farming?,Lead in,Read the text
6、 and answer the question.1. Why did many farmers welcome the introduction of chemical farming?2. What concerns many people about the use of pesticides?3. What is one problem with the use of chemical fertilisers?,It is a great way to fight crop disease and increase production.,It may make them ill an
7、d even cause cancer.,Crops grow too fast to be rich in nutrition.,4 How is organic farming different from chemical farming?5 Why do organic farmers change the kind of crop grown in a field every year?6 What is the goal of using organic farming methods?,Organic farming is without any chemicals.,They
8、put important minerals back to the soil,To grow good food without damage the environment of peoples health.,2. Match the main ideas (A-D) below with the paragraphs. Then complete the sentences in the table.A What organic farming is? B Why man-made chemicals are still used in farming? C Organic metho
9、ds for producing rich soil? D The problems with chemical farming?,Paragraph Main Idea 1-2 3 4 5,D,B,A,C,DetailPesticides can kill helpful_.Some pesticides have been _ because of the_crops grown with chemical fertilisers usually _ tofull of_.Many organic farmers use _ as fertiliser.They often _ grown
10、 in each field_.They also plant crops that use _ of the soil to help keep it rich.Organic farming is nowhere near able to meet the need,bacteria and insects,damage,prohibited,nutritions,grow too fast,natural waste,corn or wheat,one year,different depths,3. Write an argumentatives essay giving your o
11、pinion on chemical or organic farming.Discuss these questions in groups. Is the author of the passage for or against organic farming? How do you know? What other disadvantages of chemical farming did the author not list? How might the following items be problems and how important are they for organi
12、c farming? natural animal waste used as fertiliser higher cost of producing food greater effort required to farm What other disadvantages of organic farming can you think of?,Decide whether your group supports chemical farming or organic farming. Come up with three main points to support your opinio
13、n, and then add at least one detail to support each main point. Complete the outline below.In my opinion, _ farming is preferable to _ farming because(Detail)(Detail)(Detail),organic,chemical,Keep soil rich,Free of diease,Rich in minerals,Use this checklist to help you review your partners draft.Doe
14、s the writer do a good job of expressing his/her opinion?Does each paragraph have one main idea?Does each paragraph have at least one detail to support its main idea? Does the writer sequence the points in a logical order?Does the writer do a good job persuading you to accept his/her opinion?,Phrases: in turn,Words: digest; essential; mineral; alternative; grocery; depth; root,Bye-bye!,