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1、 Lesson 30 Keep the Candle Burning!Keep the Candle Burning!. Learning aims: 知识目标 Master the new words: match, light, burn, use up, shallow, candleholder, oxygen,one-fifth 2) The important sentences: Fill the dish half full of water. As the candle burns, it uses up oxygen in the air. There is about o
2、ne-fifth oxygen in the air, so the water rises and fills about one-fifth of the jar. 教学重点：1. Describe and explain the experiment inEnglish.2.分数的表达法 .教学难点:Describe and explain the experiment in English. 能力目标 ：can describe and explain the experiment in English 情感目标：Cultivate the spirit of loving scien
3、ce. 预习早知道1.match (pl)-_ light (过去式）_(过去分词） _ burn（过去式）_ (过去分词） _ v. 燃烧 use up one-fifth shallow(反义词）_ half(pl)_matchesn. 火柴;比赛 lighted/litlighted/litv. 点燃;使燃烧/照亮;使光明burned/t 用完；用光； 五分之一burned/tdeephalvesLook and Learn1 .What are they ?They are_ They are used to _something. I will use them _a candle.
4、 I am _ the candle with the match. My father often uses matches _his smoke. 2.This afternoon well have a basketball_.matches light to light lightingto lightmatch-Because burning needs _. when the candle stops buirning, it has _ _ all the oxygen in the jar. (_:They have _ all the water. )Whats this?
5、Its a_ .Its a _candle . If I put the jar over the burning candle, what will happen?-It will go out / stop _ why? candle burningburningoxygenused up use upused up一. 自主探究，合作学习1.He _the spoon_the bowl.他把汤匙放到了碗里面。2.Lily _the bottle_water. Lily 把瓶子装满了水。3.The room _ smoking. 屋子里充满了烟 。4.Please put the jar
6、_the candle.请把罐子放到蜡烛的 上面 。5.My mother_her money to buy clothing yesterday.我妈妈昨天买衣服花光(用光）了她身上所有的钱。6.In our class,_ students are boys,_ students are girls. 在我们班，三分之二的学生是男生，三分之一的学生 是女生。二. 小组合作操练，用上述新知识点造句，并在小组 内核对，交 流。putinfilledwithis full of/is filled with over used uptwo-thirdsone-third分数表达法 分子基分母序分
7、子大于 1分母加 SOne - fifth four fifthsone - third two - thirds1/5 4/5 1/3 2/3基数词 序数词分子分母5/9Practise1/4one-fourth3/7 three-sevenths. There is about one-fifth oxygen in the air, so thewater rises and fillsabout one-fifth of the jar.a quarterfive-ninths强化训练 单项选择1.The bottle is only_full. A.half B.a half C.
8、halfs D.halves2.She _the chicken bones to make soup.A.Used for B. used to C.used up D.used with3._of the students in our school_from countryside.(乡村 ）A.Four-fifths,comes B.Fourth-five,come C.Four-fifth,come D.Four-fifths,come4._of water_. A. Three-fourths, are B.Three-four，is C.Three-quarters，is D.
9、Three-fourth, is 4.The river is _here; we can walk across. A. deep B. fast C. shallow 5.Yellow is a _colour, but black is dark. A. orange B. light C. heavyACDCCBFirst. _the candle _the candleholder. Then. _the candleholder _the dish. Third. _the dish _water . Fourth. _the candle . Fifth. _the candle
10、 _for two minutes . Sixth.carefully_the jar_the candleuntil the top of the jar_on the dish.What observation can you make?How do we do the experimentput putininFillhalf full of Lightletburnputover rests1. Why did the candle stop burning ? because there was _oxygen in the jar . 2. Why did the water ri
11、se ? The force outside the jar is _ than the force inside the jar .3. How far did the water rise ? Why? It rose about _of the jar . Because there is one-fifth oxygen in the_.nostrongerone-fifth airsummaryThe new words: match, light, burn, shallow, candleholder, oxygen,The phrases and expressions:use
12、 up, one-fifth, keep sb/sth doing, keep sth/sb +adj Stop doing/to do sth, put.in/over 分数的表达：分子基，分母序，分子大于 1，分母加 S sentences Fill the dish half full of water. As the candle burns, it uses up oxygen in the air. There is about one-fifth oxygen in the air, so the water rises and fills about one-fifth of
13、the jar. How do “ keep the candle burning”用所给单词的正确形式填空：1.You are very tired. Youd better stop _(have) a rest.2. What do you use to make a candle _(burn)?3. You should put the jar over the candle _(careful).4. What _(observe) can you make?5. Please cut the apple into _(half).6. He _(light) a candle a
14、nd the room was bright.7. He kept the candle _(burn) for two hours.8. Its time _(play) basketball.9. Eating green food can help to keep you _ （health）.10.Im sorry, I kept you_ (wait) for a long time.to haveburncarefullyobservation(s)halveslighted/litburningto playhealthywaiting1.Read the text aloud and recite the experment of this lesson.2. Write “How do ”that you have learned in this unit3.Preview lesson31.Homework:Class is overBye-bye!
