1、Unit 5 Look into ScienceLesson 26: Keep the Candle Burning课题Lesson26 Keep the Candle Burning!课型New课时One教学目标知识目标:Words and expressions能力目标:Do and express the experiment德育目标:Love science教学重点一、重点词汇match, light, burn, use up, candle holder, shallow, oxygen, one-fifth, make sb do二、重点句型1. Fill the dish ha
2、lf full of water2.To make a candle burn , you light it教学难点Write a composition to describe an interesting experiment.教法Talk ,listen , read, practice学法Talk ,listen , read, practice教具tape slides板书设计Lesson 26分数的英语表达1) 分数由分子及分母两部分构成。用英语表达时，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。3) one (a
3、) half 或 one second (one-second) = one (a)quarter 或 one-quarter教 学 教 程教 师 活 动学生活动Step 1.Greetings.设计意图：让学生做好上课的准备。Step 2. Think about it.1. Do you think science is interesting? Why or why not?2. Name one or two famous Chinese scientists. What do you know about them?设计意图：与学生进行一个简短的对话，进入本课主题。Step 3. S
4、how students the pictures to let them know the process of this experiment.设计意图：通过展示图片让学生理解整个实验过程。Step 4. Read and fill in the blanksRead the text and fill in the blanks:Lets do the experiment together! Put the candle in the candle holder. Put the candle holder on the dish. Fill the dish half full wi
5、th water. Light the candle with a _ or a lighter. What can you see? The candle is burning. _ the candle burn for two or three minutes. Then carefully put the jar over it until the top of the jar rests on the dish. As the candle burns, it _ the oxygen in the air. When the candle stops _, it has used
6、up all the oxygen in the air. The water inside the jar _ and fills about _ of the jar. This is because about one fifth of the air is made up of oxygen.设计意图：让学生带着任务读课文。Step 5. Language Points1. 分数的表达1) 分数由分子及分母两部分构成。用英语表达时，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。3) one (a) half 或 one
7、second (one-second)4) = one (a)quarter 或 one-quarter设计意图：通过教师讲解让学生对重点知识更加熟悉。Step 6. Do an experiment.Can an egg “swim” in the water?First, put some salt into the glass.Then, add some water.Next, mix the salt and the water together.Finally, put the egg into the glass.设计意图：通过给学生做一个有趣的实验，一方面激发学生学习英语的兴趣
8、，另一方面让学生学习用英语来描述一个实验。Try to answer the two questions.Enjoy the process of this experiment.Read the text aloud and fill in the blanks.Let the students write the important language down.Observe the experiment, and try to describe the experiment in English.教 学 教 程教 师 活 动学生活动矫正反馈Step 7. ExercisesLet the
9、 students do some exercises about the key points.设计意图：通过练习让学生巩固本课的重点知识。Step 8. Homework请根据课文内容, 以 “An Interesting Experiment”为题写一篇小作文。Students do some exercises.课堂测试题一、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. Fi
10、ll the dish half fill of water.5. There is about onefive oxygen in the air.6. There are about twothird students in the classroom.7. I used out my money. Can you lend me some?二、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 sho
11、uld 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 and the room was bright.7. _ (two), ask the students to guess what will happen.8. He kept the candle _ (burn) for two hours.9. Its time _ (play) basketball.10. What about _ (go) for a walk?教学反思4