九年级英语上册Unit5LookintoScienceLesson26KeeptheCandleBurning学案冀教版.docx

Lesson26: Keep the Candle Burning【学习目标】知识目标：match,light,burn,shallow,candle holder,oxygen; one fifth,useup, be made up;Lightthecandle.Asthecandleburns,itusesupoxygenintheair.Thereisaboutone-fifthoxygenintheair,sothewaterrisesandfillsaboutone-fifthofthejar.能力目标：能够描述实验步骤和实验现象。情感目标：让学生形成尊重事实、用实验结果说话的态度和科学的世界观。【重点及难点】能够描述实验步骤和实验现象【导学过程】一、自主预习【预习指导】1.自学教材第25课单词与词组，你可以听录音跟读，根据音标读，或者请教别人读。做到发音标准，弄清词性和汉语意思。2.自学教材第68页内容，仔细读课文至少三遍，弄清课文大意。【自主学习】.（独学）自读课文，了解文中的实验需要什么？要做什么？会发生什么？_. 翻译下列短语。(1) ashallowdishwithwater_(2) putthecandle holderinthedish_(3) fillthedishhalffullofwater_(4) letthecandleburn_(5) 将罐子扣在蜡烛上_(6) 当蜡烛燃烧时_(7) 用完所有氧气_(8) 填充瓶子的大约五分之一_.在自学过程中，你还有哪些疑惑用横线在文中画出来，并把它写下来，和你的同伴交流。二、合作探究Task 1. 读课文，想一想下面的三个问题。(1) Whatshouldyouprepare(准备) whenyoudothisexperiment?_(2) Inthisexperiment,whereshouldyouputthejar?_(3)Howfardoesthewaterinthedishriseatlast?_Task 2. 再读课文，完成下列的实验步骤。Howdowedotheexperiment?First,_thecandle_thecandle holder.Then,_thecandle holder_thedish.Third._thedish_water.Fourth, _thecandle.Fifth, _thecandle_fortwoor three minutes.Task 3. 小组讨论导学案上的Language Notes； 完成 Lets Do It 1、2。Task 4. 分组做实验，并用英语描述实验过程及结果。三、交流展示Language Points:1. When the candle stops burning, it has used up all the oxygen in the air.当蜡烛停止燃烧时，它已经耗光了空气中的氧气。 use up 用尽；耗光。 例如：He has used up all his energy. 他已筋疲力尽。By this time he had used up all his savings. 到这时, 他的存款已全部用完。 2. Because about one fifth of the air is made up of oxygen, the water rises and fills about one fifth of the jar.因为空气的五分之一是由氧气组成的，所以水会上升到瓶子五分之一的位置。 one fifth 五分之一分数的表达：1) 分数由分子及分母两部分构成，分子用基数词，分母用序数词。2) 若分子为1，则分母的序数词为单数形式，若分子大于1，则分母的序数词用复数形式， 如：3/5 three fifths。3) one (a) half 或 one second (one-second)4) = one (a)quarter 或 one-quarter be made up of “用构成或组成的”，指结构成分，指人、物皆可。例如：I want my staff to be made up of excellent workers.我希望我的员工都非常出色。四、当堂检测. 单项选择。（）1.-Wouldyouliketogotothemovies?-Yes, _A.Iwould B.IdlikeC.Idloveto（）2. -_didtheycomeback?-Twoyearsago.A.HowlongB.When C.Howoften（）3.Iwanttohave_totellyou.A.anythinginterestingB.somethinginteresting C.interestingsomething（）4.-Lucy_ Beijingnextweek. Shewantstostaythereforaweek.A.leaves B.isleavingfor C.isleaving（）5. -IhearthatHarbinisagoodplace_.A.togoskiing B.ofskiing C. forskiing（）6.-Thestudentscouldntgotoschool _theheavysnow.A.eventhough B.because C.becauseof（）7.Isaw Mr.Wang_intheschoollibrary this morning.A.read B.reading C.to read（）8.Thereis_ rainthisspring. Thetreesdontgrowwell.A.little B.alittle C.afew（）9.-Isthebabyaboyoragirl?-_A.Yes, itis B.Itsaboy C.No,itisnt（）10.Thelittleboyis_ young_ lookafterhimself, sohismotherneverleaveshimaloneathome.A.very, too B.too, to C.so, that. 改错题。1. There are lots of matchs in the small box.2. Can you let my uncle laughing?3. Youre very ill, so you must stop to smoke.4. Fill the dish half full of water.5. There is about one five oxygen in the air.6. There are about two third students in the classroom.7. I used out my money. Can you lend me some?. 用所给单词的正确形式填空。1. You are very tired. Youd better stop _ (have) a rest.2. You should put the jar over the candle _ (careful).3. What _ (observe) can you make?4. He _ (light) a candle and the room was bright.5. _ (two), ask the students to guess what will happen.6. He kept the candle _ (burn) for two hours.7. Its time _ (play) basketball.8. What about _ (go) for a walk?五、作业布置1. 请根据课文内容, 以 “An Interesting Experiment”为题写一篇小作文。2. Preview Lesson 27.【教学反思】参考答案：一、自主预习. 略. 1. 一个装了水的浅盘子 2. 把蜡烛台放在盘子上 3. 往盘子里放半盘水 4. 让蜡烛燃烧 5. put the jar over the candle 6. as the candle burns 7. use up all the oxygen 8. fill about one fifth of the jar二、合作探究Task 1. 1. A candle, a candle holder, a big glass jar, a shallow dish, some water, and a lighter or matches. 2. We should put the jar over the candle.3. The water rises and fills about one fifth of the jar.Task 2. 1. put, in 2. put on 3. fill, half full with 4. light 5. let, burn四、当堂检测I1-5 CBBBA 6