1、2012-2013英语必修4人教版新课标Unit 2精品教案（第3课时）Period 3Extensive ReadingThe General Idea of This PeriodThis period is about the reading of the passages:Organic farming.It can help the students learn something more about the modern agriculture.Teaching Important PointsHelp the students to understand the passage
2、s and realize the importance of organic farming.Teaching DifficultiesHow to improve the students reading ability.How to help the students understand the advantages of organic farming.Teaching MethodsAsking-and-answering activity to check the students understanding of the text;individual,pair or grou
3、p work to finish each task.Teaching AidsA tape recorderA multi-media computer and a blackboardThree Dimensional Teaching AimsKnowledge and SkillsTrain the students reading ability.Learn some useful words and drill.Enable the students to know the differences between organic farming and chemical farmi
4、ng.Process and StrategiesPair work to talk about the advantages of organic farming.Individual work to finish each task.Feelings and ValueThrough the reading of this passage the students may have a better understanding of the advantages of organic farming.It is important as people are more and more c
5、oncerned about the quality of the food we eat.Teaching ProceduresStep 1 Warming up 1.Greetings2.Check the answers of the exercises about the -ing form as the subject and object.Step 2 Reading for structureT:In the Reading part we learnt something about planting rice,but do you know what is the best
6、way to plant rice?Ss:.T:Today well learn a passage about organic farming.Now please read the text and try to find out the main idea of each paragraph.Ill give you five minutes.( five minutes later )T:Who would like to tell me the main idea of Paragraph One?S:Its “What is organic farming?”T:Thats rig
7、ht.How about Paragraph Two?S:The main idea is “The fertilizer that organic farmers prefer is natural waste from animals”.T:Thank you for your good answers.Lets come to the next paragraph.S:The main idea for the last paragraph is “Organic farmers change crops every two or three years”.T:Every one has
8、 done a good job,I hope everyone got all the answers by yourself.Step 3 Reading for detailsT:Now please read the passage again,and try to find all the answers for the following questions:1.What is organic farming?2.What problems are caused by using chemical fertilizers?3.Why do organic farmers grow
9、peas or soybeans after corn or wheat?T:Finish?Any one gets the answer for the questions?Suggested answers:1.Organic farming means growing crops without chemical fertilizers.2.There are three problems.First,chemical fertilizers affect the soil and the water supply badly.Second,they allow farmers to g
10、row the same crop year after year and exhaust the soil.Third,they kill both helpful and harmful pests.3.Farmers grow peas or soybeans after corn or wheat so that peas and beans can put minerals back into the soil,making it rich and healthy and ready to grow more wheat or corn.Step 4 Extensive Readin
11、gT:Please read the text for the third time,then fill in the following table.(Five minutes later the teacher check the answers one by one.)Advantages of organic farmingReason1.Farmers use natural waste from animals.1.This makes the soil richer in minerals and so more fertile.2.The soil is not exhaust
12、ed.2.Peas and soybeans renew the minerals in the soil and it becomes rich and healthy.3.They use the soil to best advantage.3.They plant crops that need surface soil and next crops that grow at a deeper level.So the wind and water doesnt carry away the soil.All the richness of the soil is used.Step
13、5 RetellingT:Now please retell the text according to the following chart,you can discuss in groups.Organic farming1.Crops growing with natural fertilizers.2.Farmers prefer natural waste from animals.make.richer and more fertileleaving.is not goodreduce.and help.stronggrow.year after yearthe fertiliz
14、ers kill.and healthykeep free.from chemicals(Three minutes later,the teacher ask some students to have a try)Step 6 Language pointsTeacher explains the important words and expressions from the reading.Try to use as many examples as possible to illustrate the point.After illustration,teacher can give
15、 students some exercise to consolidate their understanding.Step 7 Summary and HomeworkT:Today we learned a passage about organic farming.If you are interested in it,you may find more information about it on the Internet after class.Whats more,you should finish your workbook exercises.So much for tod
16、ay!The Design of the Writing on the BlackboardUnit 3 Working the landPeriod 3Extensive reading1.reducev.make sth.smaller in size,number,degree,price,etc.e.g.The company tries to increase profits by reducing costs.We have reduced expenses this year.2.supplyv.give sb.sth.that is needed or usefule.g.He
17、 kept me well supplied with cups of coffee while I wrote the report.The shop was unable to supply what she wanted.3.refer tov.mention or speak of sb./sth.e.g.When I said some people were very stupid,I wasnt referring to you.Dont refer to this matter again.Record after TeachingActivities and Research
18、 The teacher may encourage the students who are interested in organic farming to find more information about it and share it with other students in class.*Reference for TeachingLanguage Points1.reduce v.make sth.smaller in size,number,degree,price,etc.e.g.The company tries to increase profits by red
19、ucing costs公司尽力通过减少花销来提高利润。We have reduced expenses this year.今年我们已经减少了业务开支。2.supply v.give sb.sth.that is needed or usefule.g.He kept me well supplied with cups of coffee while I wrote the report.当我写报告时,他不断地给我提供咖啡。The shop was unable to supply what she wanted.在这家商店她买不到她所想买的东西。3.refer to v.mention o
20、r speak of sb./sth.e.g.When I said some people were very stupid,I wasnt referring to you.当我说有些人是很愚蠢的时候,我不是说你。Dont refer to this matter again.别再提这件事了。Sentences and structuresFind out all the sentences with “ v.+ing” forms,and try to remember them.Translate the following sentences,and tell what part o
21、f speeches the red parts are used as.1.它也指用自然肥料而不是化肥种植的庄稼。It also refers to crops growing with natural rather than chemical fertilizers.注:growing.在句中充当定语。修饰crops。2.他们说,把这种肥料施在农田里会使土壤含有更丰富的矿物质,而（土壤）也会更加肥沃。Putting this in their fields,they argue,makes the soil richer in minerals and so more fertile.注:
22、Putting.在句中充当状语。3.这一点很重要,因为土壤改良了,农作物的病虫害就减少了,因而有助于农作物的茁壮成长。This is important because developing a healthy soil reduces diseases in crops and helps them grow strong and healthy.注:developing.在句中充当主语。4.然而使用化肥会带来很大的问题。However,using chemical fertilizers is a big problem.5.第一,在田地里长期遗留化学物质对土壤和水源不利。Firstly,
23、leaving chemicals in the ground for a long time is not good for the soil or the water supply.注:leaving.在句中充当主语。6.不同的是,有机耕作的农民们坚持每隔两三年换种农作物。Instead,organic farming insist on changing crops every two or three year.注:changing.在句中充当宾语。7.这些农作物将矿物质带回土壤,使之肥沃强效,适宜于种植要求土壤肥沃的农作物,例如玉米和小麦。These put the minerals
24、 back into the soil,making it rich and healthy and ready to grow crops that need rich and fertile soil like corn or wheat.注:making.在句中充当状语。8.但无论他们种什么,他们确保在收割后留在地里的东西成为来年农作物的天然肥料。But whatever they grow they make sure that what is left in the ground after harvesting becomes a natural fertilizer for the next years crops.注:harvesting.在句中跟after一起充当时间状语。
