英语必修5译林牛津版Unit3第6课时教案（任务1） Period 6　Task(1) The General Idea of This Period This period consists of a series of activities which provide students with an opportunity to practise their listening,speaking,reading and writing.During this period,the students will learn how to change and correct a text,how to confirm information and how to write a formal letter about a topic.They will also get some practical advice on a common social problem. Teaching Important Points Try to learn how to check and correct information—learn to identify grammatical errors and spelling mistakes,to make changes to the information in the text and change the style or tone of the text. Teaching Difficult Points When listening
,the students should know how to correct and make changes if necessary,and they are also expected to participate in a discussion effectively. Teaching Methods Situational approach and presentat
ional approach. Teaching Aids A tape recorder and multimedia. Three Dimensional Teaching Aims Knowledge and Skills By listening and practising,the Ss will learn how to change and correct a text,how to confirm information. Process and Strategies This section is divided into several steps and each step begins with a skill building activity. Feelings and Values Besides the knowledge itself,the Ss will also get some practical advice on a common social problem—giving their opinion on GM food. Teaching Procedure Step 1 Revision 根据要求写出单词的适当形式： 1.legal→（反义词）________________ 2.moral→（反义词）________________ 3.appear→（反义词）________________ 4.responsible→（反义词）________________ 5.hope→（反义词）________________ 6.disappoint→（名词）________________ 7.agree→（名词）________________ 8.conclude→（名词）_
_______________ 9.perform→（名词）________________ 10.intend→（名词）________________ Keys: 1.illegal　2.immoral　3.disappear　4.irresponsible　5.hopeless　 6.disappointment　7.agreement　8.conclusion　9.performance　10.intention Step 2 Lead in and discussion T:Let’s play a game called “Chinese whisper”,you will be divided into several groups of ten.The first student will whisper a sentence to the seco
nd student and then the second to the third until the sentence is passed to the last student in the groups.Only two minutes will be given to you.The last student in each group will report the information to the whole class.The groups coming up with the correct answer win.Try to find what mistakes each group has made and analyze what kind of mistakes they are. Here is the sentence:Mrs.Smith’s hens laid many eggs last year. Step 3 Changing or correcting a text S:Read the guidelines in Skills building 1 on Page 52.You should focus on what you should do to change and correct the information. S:Read the notes on Page 52 and think about the conversation you are going to listen to.Underline the places where you think mistakes might occur. Answers: 1.8 cm→18 cm　2.per week→every day　3.去掉not　4.45-year—old→35-year-old　5.three→two　6.14→18　 7.55→60　8.5%→85%　9.185 000→85 000 Step 4 Confirming information T:You’ve done quite good jobs.Now let’s c
ome to next job—read the notes about GM food on Page 53 carefully and confirm the information on the notes while listening to a conversation.You need to correct and make changes if necessary.Listen to the tape and do the exercises in Part A. T:Before listening,please answer some questions,they are as follows: What does GM stand for?　What is GM food?　Is it the same as natural food? S:Answer the questions. Answers: A:2.fatter→faster 3.keep→don’t help keep 4.more expensive→cheaper 5.is后加not 6.better than→the same as 7.
are后加not 8.cheaper→more expensive 9.are后加not 10.would not pay→don’t mind paying B：1.wrong 　2.wrong 　3.wrong 4.right Step 5 Conducting a discussion
T:In your daily life,you are often asked abo
ut your opinion on many things,such as,who is your favorite movie star or singer? What answers did you get for the homework? etc.Please conduct a discussion in which you give information but also ask others to give you information.Look at the useful expressions on Page 54 to help you.I will give one for example. T:Here is a picture.What would you say if you want to know my opinions on this picture? But people may have different opinions in the picture,what would you say? Please think of different ways to ask for opinions and introduce new ideas. T: Read the guidelines and compare their answers with the expressions on Page 54.They shou
ld know when to use the useful expressions. Step 6 R
eporting back to a science journal T:Since we have learnt how to ask for opinions of others and introduce new ideas,let’s practice the different expressions by interviewing a scientist about GM food. T:Please work in groups of four to discuss what questions you will ask,and write down your questions and a possible heading in the interview. S:1.Safety of GM food　Do you think it is safe for people to have GM food? 2.Possible side effects　Are there any side effects if people have GM food? 3.Taste compared with normal food　Does it taste the same as/nicer than natural food? 4.Cost　Do you agree that GM food is more expensive than natural food? 5.Need for government control 　 Do you think the government should do something to ensure its safety? If so,what should be done? 6.Popularity for buyers 　Will you or will you not buy the GM food? T:
One student acts as the scientist and one acts as the student representative to practice the dialogue. T:Students work in small groups and do Part D.Discuss the points in the box with your deskmates to gather more opinions on GM food. Step 7 Consolidation T:Work in groups and conduct more practice about asking other’s opinions. Step 8 Homework Surf the Internet to find more information about
GM food,then try to report your job　to others in the next period. The Design of the Writing on the Blackboard Unit 3　Science versus nature The sixth period Interview form 1.safety of GM food 2.Possible side effects 3.Taste compared with normal food 4.Cost 5.Need for government control 6.Popularity for buyers Records after Teaching ________________________________ ________________________________ __
______________________________ ________________________________ Activities and Research 1.Ss try to list the things they know about GM food,then try to exchange their opinions with their partners,by doing like this,they may learn from others and realize the importance of cooperation in their everyday study and life. 2.Try to learn in performance.In this period,they will act as a scientist and a student representative. ***********************************************************结束 Reference for Teaching Background information
什么是“转基因食品”(GM Food)呢？ 转基因食品，就是指科学家在实验室中，把动植物的基因加以改变，再制造出具备新特征的食品种类。许多人已经知道，所有生物的 DNA上都写有遗传基因，它们是建构和维持生命的化学信息。通过修改基因，科学家们就能够改变一个有机体的部分或全部特征。 不过，到目前为止，这种技术仍然处于起步阶段，并且没有一种含有从其他动植物上种植基因的食物，实现了大规模的经济培植。同时许多人坚持认为，这种技术培育出来的食物是“不自然的”。 世界上第一种基因移植作物是一种含有抗生素药类抗体的烟草，1983年得以培植出来。又过了十年，第一种市场化的基因食物才在美国出现，它就是可以延迟成熟的番茄作物。一直到1996年，由这种番茄食品制造的番茄饼，才得以允许在超市出售。 为什么一些人认为转基因技术或许对人类健康有害呢？批评者认为，目前我们对基因的活动方式了解还不够透彻。我们没有十足的把握控制基因调整后的结果。批评者担心突然的改变会导致有毒物体的产生，或激发过敏现象。 另外还有人批评科学家所使用的 DNA会取自一些携带病毒和细菌的动植物，这可能引发许多不知名的疾病。我们应该相信我们所吃的食物吗？ 为了确保消费者的安全和维持信心，所有食品都必须经过一系列的检测管理程序。检测程序的目的是在食品上市前就发现问题。如果消费者不幸因为所吃的食品而得病，这往往是因为食品生产线存在问题。 Language points 1.cost n.［U］the amount of money needed to buy,do or make something For many parents,two salaries are essential to cover the cost of(=pay for)school fees. 对于许多父母来说,两份薪水支付上学的费用是很基本的。 2.look forward to:-ing form of v./n. She was looking forward to seeing the grandchildren again. 她盼望着再次看到她的孙子孙女们。 带to doi
ng的常用结构 1.动词+介词to+动名词 admit to doing sth 承认做了某事 apply to doing sth 适用于做某事 object to doing sth 反对做某事 see to doing sth 负责做某事 stick to doing sth 坚持做某事 take to doing sth 喜欢上做某事，逐渐习惯做某事 devote to doing sth 贡献…… appeal to doing sth 呼吁…… 2.动词+宾语+介词to+动名词 apply oneself to doing sth 专心致志做某事 limit sth to doing sth 把……限制在做某事的范围内 give one’s life to doing sth 献身于做某事 pay attention to doing sth 注意做某事 set one’s mind to doing sth 决心做某事 addict oneself
to doing sth 沉溺于做某事 3.be+形容词+介词to+动名词 be equal to doing sth 能胜任做某事 be used to doing sth 习惯于做某事 be opposed to doing sth 反对做某事 be reduced to doing sth 使某人沦为做某事 be devoted to do
ing sth 献身、致力于做某事 be limited to doing sth 把……限制在做某事的范围内 Exercises Related to This Unit 1.They teach the vocabulary of the English used in computer science,which is also listed________________in the glossary. A.in sum 　B.in total 　C.in general D.in full 答案:D 解析:in full“全部地/彻底地”，in total “合计/总共”，in sum“总而言之”，同in general。 2.He couldn’t________________an answer when I asked him why he was late. A.end up with B.come up with C.catch up with D.fit in with 答案:B 解析:end up with“以……结束”，come up with“提出”，catch up with“赶上”，fit in with“符合/适应”。 3.The man whom I think to be a black sheep in our village will________________the imprisonment. A.end up with B.be ended up with C.end up with D.be ended up with 答案:A 解析:end up with意思同上题解析。 4.Some day,we will________________the natural energy,leaving nothing to our children and grandchildren. A.use all B.run out C.use up D.run out all 答案:C 解析: use up意思是“用光”，相当于run out of。 5.Before the college entrance examination,many students have shown________________of tension.Some have trouble in sleeping while others have lost their appetite(胃口). A.anxiety B.marks C.signs D.remarks 答案:C 解析:anxiety“忧虑/挂念”，marks “分数/记号/踪迹”,sign“标记/迹象”。

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