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2019-2020年高一英语 Unit16Scientists at work第三课时精品教案 旧人教版第一册Teaching Aims:1.Review the words learnt in the last period and learn their different meanings by heart.2.Learn to guess the meaning of pounds.3.Learn to describe the two parts of some pounds.Teaching Important Points:1.Learn and master the different meanings of some verbs.2.Learn to guess the meaning of pounds and learn to describe some pounds.Teaching Difficult Points:1.How to describe the two parts of some pounds.2.How to guess the meaning of the pounds.Teaching Methods:1.Review method to consolidate what weve learnt.2.Practice to make the students learn the way of guessing pounds and describing them.3.Individual,pair or group work to make every student work in class.Teaching Aids:1.a slide projector2.a puter for multimedia useTeaching Procedures:Step .GreetingsGreet the whole class as usual.Step .RevisionT:In the last period we learnt a passage about Franklins famous kite experiment.Now Ill ask one or two students to retell the experiment.Whod like to?S1:Ill try.In June 1752,Franklin wanted to show that lightning and electricity were the same.He decided to do an experiment using a kite,so he built a strong kite of silk.When the first thunderstorm came,with his sons help,he took his condenser to a shed in the fields and flew the kite high.It began to rain,but nothing happened.when they were waiting in the rain,he saw some hairs on the string stood up.The string was getting charged.He brought his finger close to the key and felt a light but very clear electric shock.That experiment succeeded and proved that lightning and electricity were the same.T:Very good.Now Ill ask another student to describe an experiment done before.Any volunteers?S2:Last year I did an experiment about the character of roots growing towards water.Let me describe it.I wanted to show the roots of plants grow towards the direction of the place with water.I thought much and I found the best way to prove it.First,I found two pots with the same soil and plants in each of them.I marked them with No.1 and No.2 on each pot.Then in No.2 pot I dug a hole which was a certain distance from the plant.I put some water around the plant in the first pot but some water into the hole of the other.Some days later,I took them out of the soil.To my surprise,the roots of the plant in No.1 grow as usual,while the roots of the other plant grow towards the hole.It proved that the roots of plants grow towards the direction of the place with water.Step .Word StudyT:In the passage learnt yesterday we learned some important words,such as,charge,conduct,cross,sharp,tear,tie and so on.Please find out the sentences including the words from the passage.(Teacher asks students to read the sentences and shows them on the screen.)1.Benjamin Franklin conducted a number of experiment in which he showed what electricity is.2.The string was getting charged.3.Build the frame of the kite by making a small cross of two pieces of light wood.4.Add a tail to the frame and tie a long string to the cross so you can control the kite.5.First,fix a very sharp piece of metal,pointing a foot or more above the frame to the top of the longest of stick of the cross.T:Please look at the sentences and put them into Chinese.Meanwhile,tell me the meanings of the underlined words.Suggested answers:1.conduct vt.指导；进行富兰克林做了许多实验，在这些实验中他证实了电是什么。2.charge vt.充电我看见风筝线上的纤维直立起来，这根线有电了。3.cross n.十字形用两根木条绑了个十字形的框架。4.tie vt.系往框架上加一个尾巴并且把一根长绳系到十字形的框架上，以便你能控制这个风筝。5.sharp adj.尖的首先，把一根尖尖的金属固定在框架中最长的木条上，并且要超出框架一英尺左右。T:Very good.Now open your books and turn to Page 19.Lets do Word Study.In this part,well learn the usages of some words.For each word,there are three examples and three meanings.In one of the sentences,the word has the same meaning as it does in the reading text.Now translate the sentences into Chinese and tick the proper sentence.(Teacher asks some students to finish the task and then shows the form on the screen.) The answers to the exercise:Charge 3;conduct 3;cross 1;sharp 2;tear 1;tie 3Step .Word FormationT:(Pointing to the blackboard)what do we call it?Ss:Blackboard.(Teacher writes it on the blackboard.)T:The word“blackboard”is a pound which is made up of two parts“black”and“board”.We can guess the meaning of the word “blackboard”according to the meanings of “black”and“board”.Now lets try to guess what some words mean according to the two parts.First read the example.(Teacher asks students to prepare in groups.They can discuss them if there is any difficulty.At last,teacher checks the answers.)Suggested answers:1.football2.icecream3.waterskiing4.greenhouse5.downtown6.store keeper/shop keeper(Write them on the blackboard.)Step .PracticeT:So far we have learnt many pounds.I think you can remember them.Now play games in pairs.One student writes down your descriptions of the two parts of some pounds;the other one tries to guess what the pounds are.Prepare it in pairs.After a while;Ill ask some of you to do this in front of the class.(After a few minutes.)T:Are you ready?which pair would like to act?S3 and S4:Well do.T:Youre very clever.Well done.Step .Summary and HomeworkT:Today weve reviewed some words and learned different meanings of some words.Also weve learned how to describe two parts of pounds and how to guess the meaning of a pound.After class,try to find more pounds and guess what each pound means.If you can often do so,you can enlarge your vocabulary.So much for today.Class is over.Step .The Design of the Writing on the BlackboardUnit 16Scientists at workThe Third Periodpounds:blackboard black+board=blackboardfoot+ball=footballice+cream=icecreamwater+ski=waterskigreen+house=greenhousedown+town=downtownStep .Record after Teaching_
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