冀教版九年级英语Unit 5 Lesson26《keep the candle burning》课件(共25张PPT).ppt

1、5Lesson 26 Keep the Candle BurningThink about Do you think science is important,Why or why not?Name one or two famous Chinese scientists.vScience is so important!Im sure youll like this experiment!a candlea candle holdera big glass jara shallow dishmatchesor a lighterWhat do you need?Before the expe

2、rimentvWhat do we need?a candle,a candle holder,a big glass jar,a shallow dish,some water,a lighter or matches.Do we have a candle holder?No，we dont have a candle holder.What do we do?v1.Put the candle in the candleholder.v2.Put the candleholder on the dish.v3.Fill the dish half full with water.v4.L

3、ight the candle.v5.Let the candle burn for two or three minutes.GUESS!vWhat will happen?v If I put the jar over the candle until the top of the jar rests on the dishWhat is happening?vExamine the water in the jar.What can you see?1.Why did the candle stop burning?Because it has used up all the oxyge

4、n in the jar.2.How far did the water rise?It rose about one fifth of the jar.L2601.swfListen carefully and answerRead the text by yourselves and do exercises 1 and 2.Group workDiscuss the experiment in groupsI will ask two students to do it in front of the class.In the group,one descibes the report

5、in English,the other does the experiment.v1.Keep the candle burning!让蜡烛燃烧！vkeep sth.(sb.)doing,使某物（某人）保持做某一动作。e.g.Dont keep the boy waiting.不要再让那个 男孩再等了。2.use up 意为“用完；用光”。use up 是动词加副词型短语，宾语是代词时必须放在use和up的中间；宾语是名词时，放在use和up的中间或 up的后面均可。如：我妈妈用光了所有的热水。My mother used up all the hot water3.A football m

6、atchA box of matches4.Because about one fifth of the air is made up of oxygen,the water rises and fills about one fifth of the jar.one fifth意为“五分之一”,这是一个分数。分数表达方式口诀：(分子)基数词,(分母)序数词。分子大于一，分母加“s”。【注意】分数后面跟of短语作主语时,谓语动词的单复数由of后面的名词的单复数决定。我们班三分之二的学生来自于农村 Two thirds of the students in our class_from coun

7、tryside.五分之四的纸张是由木头制成的。Four fifths of the paper _made from wood.areisbe made up of意为“由组成”,表示由多种成分、团体、成员或单位等组成,并强调整体的构成或组成。我们班由52个同学组成Our class is made up of fifty-two students.GAME1.当蜡烛停止燃烧时，它已用光了空气中所有的氧气。When the candle _ _,it _ _ _ all the oxygen in the air.stops burninghas used up2.我们班里五分之三是女生。_ _ of the students in our class are girls.Three fifths3.Look!The boy is playing with some _(火柴).matches4.The medical team_five experienced doctors.(由.组成)is made up ofLets work hard to discover the new world!Never give upHomeworkChoose an experiment that you did before,and describe it in English.