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1、Unit 2 Working the landPeriod 4 Using language: Extensive readingTeaching aims:I. Topics: Chemical or organic farmingII. Useful words and expressions: Chemical, production, bacteria, pest, nutrition, mineral, discovery, focus, soil, reduce, root, skim, underline, summary, comment, build up, lead to,
2、 focus on, keep.free from/ ofIII. Ability and emotion1. Develop Ss reading skills by extensive reading and enable them to learn how to use different reading skills to read different reading materials.2. Have Ss tell about modern agriculture and organic farming.3. Let Ss have a better understanding o
3、f organic farming and pay attention to the quality of food we eat.Step1 Leading inAsk Ss what they know about organic farming. Collect their ideas on the blackboard. Step 2 Skimming Ask Ss to skim the passage and find the main idea of this passage and each paragraph.Paragraph&passageMain ideaParagra
4、ph 1Paragraph 2Paragraph 3Paragraph 4PassageStep 3 Scanning1 Ask Ss to scan the passage to locate particular information and answer the following questions in Exercise 1 an then fill in the form about the methods and advantages in Exercise 2. Methods of organic farming Advantages of methods1.Farmers
5、 use natural waste from animal.This makes the soil richer in minerals and so more fertile.Step 4 Careful readingAsk Ss to read the passage carefully and then write a summary of the passage following the procedure in Exercise 3.1).What is organic farming?2).What problems are caused by using chemical
6、fertilizers?3).Why do organic farmers grow peas or soybeans after corn or wheat?Step 5 RetellingNow 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
7、more fertileleaving.is not goodreduce.and help.strong grow.year after yearthe fertilizers kill.and healthykeep free.from chemicalsStep 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 illust
8、ration, teacher can give students some exercise to consolidate their understanding.Language Points1. Many farmers welcomed them as a great way to stop crop disease and increase production.很多农民喜欢使用化肥，把化肥作为防止农作物病虫害和提高产量的重要手段。production：n. 生产，制造e.g. _ of computers has increased double in the last few w
9、eeks. 近几周以来电脑的产量增加了一倍。 This new theatre is becoming known for its good _. 这家新剧院因上演的节目好而渐渐出名。2. These chemicals in the food supply build up in peoples bodies over time. 随着时间的推移，食物中的这些化学成分会在人体中堆积。Build up: 变得更大、更多或更强e.g. Traffic is _ _ on roads into the city. 来往的车辆在通往市区的路上越聚越多。 The disease can also _
10、_ pressure in the inner ear leading to severe earaches. 这种疾病还会使内耳的压力更强，从而导致严重的耳聋。3. Many of these chemicals can lead to canner or other illnesses.很多化学成分能导致癌症或其他疾病。lead to: 导致（某种）结果；造成e.g. This misprint _ _ great confusion.这个印刷错误造成很大的混淆。Closing the factory will _ _ 300 job losses.4.They focus on keep
11、ing their soil rich and free of disease.他们（农民）关心的是保持土壤肥沃并且免受病害。focus on: 集中（注意力、精力）于e.g. Please _ _ _ _ the following problem.请集中精力思考下列问题。Many papers _ _ _ _ the controversy surrounding foreign affairs. 这些论文使他们的注意力集中在外交事务的争议上。5. A healthy soil reduces disease and helps crops grow strong and healthy.
12、肥沃的土地能减少病虫并促进植物生长得更茁壮。reduce：v.减少；减缩e.g. The company tries to increase profits by _ _.公司尽力通过减少花销来提高利润。We _ _expenses this year.今年我们已经减少了业务开支。6. They feel that this makes the soil in their fields richer in minerals and so more fertile. This also keeps the air, soil, water and crops free from chemical
13、s.他们认为这样会使地里的土壤更富含矿物质，因而也会更加肥沃，同时还可以让空气、土壤、水以及农作物不受化学物质的污染。keepfree of/from: 使免受（影响；伤害）e.g. Eating well and good exercise _ _ _ _ cold. 健康饮食和锻炼使你远离感冒。keep (oneself) from doing sth: 克制自己不做某事e.g. I just managed to _ _ _ falling. 我努力不让自己摔倒。keep sth from sb: 不想将某事告诉某人e.g. She knew that Paul was _ _ _ _.
14、 她知道保罗有事瞒着她。Step7 HomeworkFinish off the Workbook exercises P49. 自测自评：.单词拼写1.H is one of the biggest problems in developing countries.2.The o of grain has doubled in China in the last ten years.3.He enjoys playing the v while his brother likes singing.4.Are you s with your exam result?5.N fertilizers are better than chemical ones.6.The American people (斗争)to get independence from Britain.7.His skin is black because he got (日晒) in his holiday.8.Middle school students are not allowed to drive (摩托).9.China is rich in （矿产） resources.10.It i
