2019-2020年高中英语（人教大纲）第二册下：Unit18 Inventions(第四课时).doc

2019-2020年高中英语（人教大纲）第二册下：Unit18 Inventions(第四课时)Teaching Aims:1.Learn a reading passage to improve the students reading ability.2.Do some writing practice to improve the students writing ability.3.Learn some useful words and expressions.Teaching Important Points:1.Improve the students integrating skills.2.Review the Attributive Clause.Teaching Difficult Point:How to improve the students integrating skills.Teaching Methods:1.Reading and understanding to improve the students reading ability.2.Writing practice to improve the students writing ability.3.Individual or pair work to make every student work in class.Teaching Aids:1.the multimedia2.the blackboardTeaching Procedures:CStep GreetingsGreet the whole class as usual.CStep Lead-in and ReadingT:How many of you have a puter at home?Please put up your hands.(Some students put up their hands.)Good.Most of you have a puter.What do you do with your puter?S:I search for information on the Internet.And sometimes I play games with it.T:Does anybody do anything else with it?S:I sometimes draw pictures or type something.S:For me,I sometimes send e-mails to my friends.S:I listen to the music.S:I watch football matches.T:Do you think the puter is really useful to you?S:Not exactly.I can also do these things without a puter.I can go to a library to look for the information that I need.But its much quicker and more convenient if I use a puter.S:I can listen to the music on a tape recorder.S:I can watch football matches on TV.T:Youre quite right.New technology is often used in old ways.Now,please have a discussion in groups of four to plete the chart shown on the screen.(Show the following on the screen and give the students a moment to have a discussion.)Technology Usageputer Used as a typewriter The InternetUsed as a library (After a few minutes,ask several students to say their answers.Students may have various answers.)Suggested answers:Technology Usageputer Used as:a typewritera projectora video game playera drawing boardThe InternetUsed as:a librarya TVa telephonea radioUsed to:send e-mailsread news from home and abroadCellphoneUsed as:a telephonea telephone directorya video game playera watch/calendaran alarm clockUsed to: send information to othersT:Well done!Now,lets read the passage about new technology carefully.Try to find out the answers to the two questions on the screen.After you finish,you may have a discussion in pairs.(The following questions are shown on the screen.)1.Why are scientific metaphors like “memory”and“cut and paste” useful?How may they limit our thinking?2.Think of more words we use to talk about puters and Internet.How well do they describe the things or actions they are used for?Are there other words we could use that might be better?(A moment later,check the answers with the whole class.Students may have various answers to the second question.)Suggested answers:1.They make it easier for us to understand and use a new tool.They may make it more difficult for us to use the new invention in the best way.2.Words like:copy,file,delete,lock,enter,return,storeCStep ExplanationT:Now,I think youve understood the passage well.Please look at the screen.Ill explain some expressions that you must master.Please listen carefully.(The multimedia shows the following.)Language Points:1.sb. be said to bee.g.He is said to be a good basketball player when he was young.2.A be similar to Be.g.His new bike is similar to mine.3.be different frome.g.Our life is different from what it was ten years ago.4.now thate.g.Now that youve grown up,you must stop this childish behaviour.(Explain the notes to students and write the following on the blackboard:sb. be said to be;A be similar to B;be different from;now that.)CStep Listening and Reading AloudT:Now,lets listen to the tape carefully.You can read after it when I play it the second time.Pay more attention to your stress.Are you ready?Ss:Yes.T:OK.Lets begin.(Play the tape twice for students to listen and repeat.After listening to the tape,students are allowed to read the passage aloud for a while.At last,ask some of them to read the text.One student,one paragraph.)CStep WritingT:Just now,weve talked about puters.Most of you have a desktop puter at home.(Stick a picture of a desktop puter on the blackboard.)And as you can see,Im using a laptop puter.(Stick a picture of laptop puter on the blackboard.)These are the most popular puters that we can find.But have you heard that a new type of puterthe palmtop puter,has been invented?Ss:No.T:It doesnt matter.(Stick a picture of a palmtop puter on the blackboard.)Look at the picture.This is a palmtop puter.We know from the picture that a palmtop puter is a kind of puter that we can put on our palm.Its very small,light and convenient to carry about.Do you like it?Ss:Yes,I wish I could have one.T:Certainly youll have one someday in the future.From these three pictures we know that puters are getting smaller and smaller.Theyre being more and more convenient to be carried about.Can you guess what the first puter was like?S:I guess it must have been a very big one.T:Youre quite right.(Stick the picture of the Eniac on the blackboard.)Look,this is the first puter.It is as big as a house.Maybe you cant imagine how big it is.But it doesnt matter.What we need to know is that puters are being smaller and smaller,lighter and lighter.What do you think they will look like in the future and how we will use them?Whod like to tell us your opinion?S:Let me try.I think puters may look like a watch or a cellphone in the future.They will bee even smaller.We can use them to watch TV,read books,search for information,chat with our friends,check the date and the time,and send information to others.T:Very good.Now,imagine that you had to describe a puter to someone who lived in the 19th century.How would you explain it?What would you pare it to?You may have a short discussion in groups of three and then write a short description.(Allow the students a few minutes to discuss and write their positions.If time limits,allow the students to finish their writing after class.)Sample description:Have you seen a puter?Let me tell you something about it.A puter is an electric calculating machine that can store and recall information and make calculations at very high speed.It is a wonderful machine and can do most of the things people can do,but it can work millions of times faster.The first large,modern puter was built in 1946,and people needed a large house to put it in.In the last few years there have been great changes in puters.Today they can be used in many fields.People even use it to pay their bills or order what they want.It is said that in the future puters would arrange everything for people,and do almost all kinds of work.That would be a real puter society!CStep Summary and HomeworkT:Today weve read a passage about the scientific metaphors.Weve talked more about new technology too.In this unit we also learnt how to bee more creative by practising good thinking strategies.They can be used to study English,too.Read the tips on Page 64 carefully and try the ideas in future.Theyre helpful for your study of English.Besides,weve reviewed the Attributive Clause.After class,you should do more practice by yourselves to master it better.Finally,have a discussion with your partner to find the answers to the two questions in Checkpoint 18 on Page 64.Ill check your answers tomorrow.OK.Thats all for today.Suggested answers:1.Rephrase,impossible,crazy,break away from,explore,bine,trial,2.Convenient,environmentally,friendly,automatically,CStep The Design of the Writing on the BlackboardUnit 18 InventionsThe Fourth PeriodLanguage Points:sb. be said to bebe different fromA be similar to Bnow thatputers:CStep Record after Teaching