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1、 Lesson 30 Keep the Candle Burning! Keep the Candle Burning!. Learning aims: 知识目标知识目标Master the new words: match, light, burn, use up, shallow, candleholder, oxygen,one-fifth2) The important sentences: Fill the dish half full of water. As the candle burns, it uses up oxygen in the air. There is abou
2、t one-fifth oxygen in the air, so the water rises and fills about one-fifth of the jar. 教学重点：教学重点：1. Describe and explain the experiment in English. 2.分数的表达法 .教学难点教学难点: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
3、 loving science. 预习早知道预习早知道1.match (pl)-_light (过去式）过去式）_(过去分词）过去分词）_burn（过去式）（过去式）_ (过去分词）过去分词）_ v. 燃烧燃烧use upone-fifthshallow(反义词）反义词）_half(pl)_matches lighted/litlighted/lit v. 点燃点燃;使燃烧使燃烧/照亮照亮;使光明使光明burned/t用完；用光；五分之一burned/tdeephalvesWatch ,Say,answer and Fill First. _the candle _the candlehold
4、er.Then. _the candleholder _the dish.Third. _the dish _water .Fourth. _the candle .Fifth. _the candle _for two minutes .Sixth.carefully_the jar_the candle until the top of the jar_on the dish. What observation can you make?How do we do the experiment putputininFillhalf full ofLightletburnputoverrest
5、sLets do it! Come on ! Step 1. Put the candle in the candleholder.Step 2. Put the candleholder in the dishStep 3. Fill the dish half full of water.steps Steps:Step 5.Step 5. Let the candle burn for Let the candle burn for two or two or three minutesthree minutesStep 6. Carefully put jar over the can
6、dle until the top of the jar rests on the dish Step 4. Light the candle.Think ,Read and Anwser1. Why did the candle stop burning ?because there was _oxygen in the jar .2. Why did the water rise ?The force outside the jar is _ than the force inside the jar .3. How far did the water rise ? Why? It ros
7、e about _of the jar .Because there is one-fifth oxygen in the_.nostrongerone-fifthairLets practice- Come on !Who can read them?Lets practice- Come on !Who can read them?Who can do the experiment?1. use up 用尽，用光用尽，用光 use up the oxygen 用光氧气用光氧气 It has used up all the oxygen in the air. 它已用光了空气中所有的它已用光
8、了空气中所有的氧气。氧气。 eat up drink up eat up drink up 2.one-fifth 五分之一五分之一 one-fifth oxygen 五分之一的氧气五分之一的氧气 one-fifth of the jar 罐子的五分之一罐子的五分之一 one-second one-second one-third one-third Read them loudly-You can do it!3.burn v. 燃烧燃烧 stop burningstop burning 停止燃烧停止燃烧停止燃烧停止燃烧 make the candle burnmake the candle
9、 burn 使蜡烛燃烧使蜡烛燃烧使蜡烛燃烧使蜡烛燃烧4. light v. 点燃点燃 light the candle 点燃蜡烛点燃蜡烛一一. 自主探究，合作学习自主探究，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 _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(
10、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。二二. 小组合作操练，用上述新知识点造句，并在小组小组合作操练，用上述新知识点造句，并在小组 内核对，交内核对，交流。流。putinfilledwithis full of/is filled withoverused uptwo-thirdsone-third强化训练强化训练单项选择1.The bottle is only_full. A.half B.a half C. halfs D.halves2
11、.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. Three-fourth, is
12、4.The river is _here; we can walk across. A. deep B. fast C. shallow5.Yellow is a _colour, but black is dark. A. orange B. light C. heavyACDCCBsummaryThe new words: match, light, burn, shallow, candleholder, oxygen, The phrases and expressions: use up, one-fifth, keep sb/sth doing, keep sth/sb +adjS
13、top doing/to do sth, put.in/over分数的表达：分子基，分母序，分子大于分子基，分母序，分子大于 1，分母加，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 the jar.How do “ keep the candle burni
14、ng”Todays homework-its easy! With a group of classmates, practice the experiment. Do it again and again. As you do it, describe it in English.用所给单词的正确形式填空：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
15、 candle _(careful).4. What _(observe) can you make?5. Please cut the apple into _(half).6. He _(light) a candle and 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
16、a long time.to haveburncarefullyobservation(s)halveslighted/litburningto playhealthywaitingLook and Learn1 .What are they ?They are_ They are used to _something. I will use them _a candle. I am _ the candle with the match. My father often uses matches _his smoke. 2.This afternoon well have a basketb
17、all_.matcheslightto lightlightingto lightmatchLook and Learn-Because burning needs _. when the candle stops buirning, it has _ _ all the oxygen in the jar. (_:They have _ all the water. ) Whats this? Its a_ .Its a _candle . If I put the jar over the burning candle, what will happen?-It will go out / stop _ why? candleburningburningoxygenused upuse upused up
