1、5Lesson 26 Keep the Candle Burningkeepdoing学习目标objectives1.能记忆本课重点单词和短语:holder,shallow,lighter,match,examine,oxygen；use up；be made up of2.能自己动手做实验，用英语描述实验 步骤。holder n.支托物shallow adj.浅的lighter n.打火机；点火器match n.火柴 v.相称；相配examine v.检查oxygen n.氧气WordsLead inmatchlighterlight V.点燃candle holder n.burna ca
2、ndlea candle holdera big glass jara shallow dishmatchesa lighterWhat do you need?Listen to the tape and fill in the blanks.First,_the candle_ the candle holder.Second,put it on the _.Third,_the dish_ full with water.Fourth,_ the candle.Then,let the candle _ for 2 or 3 minutes.Finally,put the jar _ t
3、he candle _ the top of the jar rests o n the dish.what can you find?The water in the j ar _ _ because the candle has _ up the _in the air in the jar.putindishfillhalflightburnoveruntilristsustedoxygenWhat do you do?1.Put the candle in the candle holder.2.Put the candle holder on the dish.3.Fill the
4、dish half full with water.4.Light the candle 5.Let the candle burn for two or three minutes.6.Carefully put the jar over the candle until the top of the jar rests on the dish.7.Look at（Examine）the water in the jar.?Read and answer the questions.What can you see Why does the water in the jar rise?How
5、 far does the water rise?Why?The candle stops burning,The water inside the jar risesBecause about one-fifth of the air is made up of oxygen，the water rises and fills about one-fifth of the jarAbout one-fifth of the airWhat is happening?As the candle burns,it uses the oxygen in the air.When the candl
6、e stops burning,it has used up all the oxygen in the jar.The water inside the jar rises.How far dose the water rise?Because about one-fifth of the air is made up of oxygen，the water rises and fills about one-fifth of the jar.6.As the candle burns,it uses up oxygen in the air.当蜡烛燃烧的时候，需要消耗空气中的氧气。as 在
7、此为“当的时候”。它有着多重意义。Please do it again as I did.请像我做的那样再做一遍。（像一样）As it is late,I have to leave now.由于天太晚了，我得走了。（由于，因为）You will find the building as you reach the end of the street.当你走到这条街那头，你就会看到那座大楼。（当时候）use up用光，耗尽。表示完全，彻底。He was hungry and ate up the bread.他饿了，把面包全吃光了。（eat up吃光）Jim used up his money
8、 to buy the computer.吉姆为了买电脑花光了所有的钱。light v.点燃，照亮3.light the candle 点亮蜡烛=make the candle burn使蜡烛燃烧 light n.光，光线（不可数）；电灯（可数）light adj.颜色浅的（反义词dark）；（分量）轻的（反义词heavy）7.*About one fifth of the air is made up of oxygen,the water rises and fills about one-fifth of the jar.空气中五分之一是由氧气组成的，所以水面上升并且占据了瓶子的五分之一
9、。*分数的表达：分数=分子分母基数词序数词1序数词1序数词+se.g.1/3，one third 1/5,one fifth 3/4,three fourths 2/5,two fifthsbe made up of “由.组成或构成的”。指结构成分，指人、物皆可。The medical team is made up of five experienced doctors.be made of/from.都是表示由.制成的.be made of 是可以看得出原料的.例如 The desk is made of wood.而be made from.是不可以看出原料的.例如 Paper is made from wood.Post-readingLets do itFinish the exercises on page 69 and check them.Homework1.课后自己动手边做实验边用英语进行描述。2做同步训练。3.预习27课Homework
