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Unit 5 Look into Science
课时 Lesson 26: Keep the Candle Burning 课型 新授课
教学目标 1. 语言能力掌握单词：match接触单词：holder, shallow, lighter, examine, oxygen短语：use up, be made up of 2. 学习能力(1)掌握本课所学的单词和英语表达； (2)能用英语描述实验步骤及所看到的实验现象。3. 思维品质相信科学，热爱科学，运用科学，服务人类。
教学重点 掌握本节课所学的单词和英语表达。
教学难点 能用英语描述实验步骤及所看到的实验现象。
教学准备 PPT 课件；生词图片；课文音频。
教 学 过 程 Step 1 RevisionGet the class to describe the experiment in Lesson 25 according to the pictures. Step 2 Presentation 1. Show the class some pictures, and teach the new words holder, shallow, lighter, match by talking about the objects used in the experiment.(1)Teacher says: Do you like doing science experiment Why or why not Today, we’ll do another science experiment. What do we need Look！This is a candle. And what’s this It’s a candle holder. And we need a big glass jar. a big glass jar(2) Teacher says: Look at the dish. Is it deep No. It’s shallow. We also need some water. a shallow dish 一个浅盘子 some water/ l / adj. 浅的(3) Teacher says: We also need two things. What are they The first one is a lighter, and the second one is a box of matches. a lighter 一个打火机 matches / la t / n.打火机；点火器 /m t / n. 火柴 v.相称；相配2. Read the new words following the recording, and read the expressions alone. Then remember them. holder n. 支托物；持有者shallow adj. 浅的lighter n. 打火机；点火器match n. 火柴examine/ ɡ z m n / v. 检查oxygen / ks d n/ n. 氧气use up 用光；用完be made up of... 由……组成Step 3 Listening and reading Part 1 Get the class to listen and answer the question.How many things can we need Answers: Six.Part 2 1. Get the class to listen and put the sentence in the right order. □Light the candle. □Examine the water in the jar. What can you see □Carefully put the jar over the candle until the top of the jar rests on the dish .□Put the candle in the candle holder.□Fill the dish half full with water.□Let the candle burn for two or three minutes.□Put the candle holder on the dish.Answers: 4 7 6 1 3 5 22. Get the class to read and answer the questions. (1) How much water should we fill the dish (2) How long should we let the candle burn (3) Where should we put the jar Answers: (1) Half full of the dish. (2) Two or three minutes. (3) Put it over the candle until the top of the jar rests on the dish.Part 31. Get the class to listen and answer the question. What is happening Answer: The water inside the jar rises. 2. Get the class to read and answer the questions. (1) Why does the water rise (2) How far does the water rise Answers: (1) When the candle stops burning, it has used up all the oxygen in the air. So the air pressure outside the jar is stronger than that in the jar, and the force of the air outside makes the water inside rise. (2) One fifth of the jar.Step 4 Reading and filling Get the class to read the lesson and fill in the blanks. (Let’s Do It! No.1) Let’s do the experiment together! Put the candle in the candle holder. Put the candle holder on the dish. Fill the dish half full with 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 jar. When the candle stops_________, it has used up all the oxygen in the jar. The water inside the jar _________ and fills about ________ of the jar. This is because about one fifth of the jar is made up of oxygen. Answers: match, Let, uses, burning, rises, one fifthStep 5 Reading, finding and translatingfill…with...用……装满…… on the dish 在盘子里 put... over...把……罩在……上面 the top of ……顶部 stop doing sth. 停止做某事 use up 用光，用完 one fifth of… ……的五分之一 be made up of… 由……组成Step 6 Reading and retelling Get the class to read the passage and then retell it according to the pictures.Step 7 Exercises Circle the correct words to complete the sentences.(Let’s Do It! No.2)1. Don’t ( use up / push up ) all of the ink. Leave some for me.2. The medicine team ( is made of/ is made up of ) five experienced doctors.3. Please fill the hole ( with / in ) sand and water.4. They didn’t realize their mistake ( until / as ) we told them.5. My brother wasn’t (strong enough / enough strong ) to lift the box.Answers: 1. use up 2. is made up of 3.with 4. until 5. strong enoughStep 8 ProjectSCIENCE THAT’S INTERESTING!Read about the experiment in this lesson. With a group of classmates, practice the experiment. Do your experiment in front of the class. Don’t forget the following things: First, describe your experiment. Second, ask the class what they think will happen. Third, do the experiment. Finally, ask the class if the result is what they expected.Step 9 SummarySum up what we’ve learnt in this period with the class. 1.本课所学的词汇 match holder shallow lighter examine oxygen use up be made up of 2. 如何描述实验步骤Step 10 Language points1. a lighter or matches打火机或火柴match ① n. 火柴。复数形式matches。 a box of matches 一盒火柴 ② n. 比赛。复数形式matches。 three basketball matches 三场篮球赛 ③ v. 相称；相配 Your tie matches your suit. 你的领带和你的套装相配。2. Examine the water in the jar. 检查广口瓶里的水。 examine v. ① 检查。 后接名词或代词作宾语。 The doctor examined the patient. 那位医生检查了那位病人。 ② 考核，测验 Our teacher will examine us on history. 我们的老师将测验我们的历史。 【拓展】examination (examine的名词形式) 检查，考试 All patients had a complete physical examination. 所有的病人都进行了全面体检。 have an entrance examination 参加入学考试3. 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 用光；用尽(=run out of) 其主语往往是人，宾语往往是物。 Jim used up his money to buy the computer. 吉姆为了买电脑花光了所有的钱。 【注意】use up为“动词+副词”结构，名词作宾语时，位于up前后都可， 人称代词作宾语时，须放于use 与up之间。 There is no paper. We have used it up.没有纸了。我们已经用完了。 4. Because about one fifth of the air is made up of oxygen… 因为空气中氧气的含量大约占五分之一…… (1)分数的表达 分子 →基数词→ >1 分母→序数词→ +s1/3 one third 1/6 one sixth3/4 three fourths 2/5 two fifths【注意】 “分数+of+名词”作主语时，谓语动词的单复数由of 后名词的单复数而定。 About two thirds of the water in the river comes from Yi River.这条河大约三分之二的水来自沂河。About two thirds of the children like playing computer games.大约三分之二的孩子喜欢玩电脑游戏。(2) be made up of...由……组成 表示由多种成分、团体、成员或单位等组成，并强调整体的构成或组成。 The team is made up of 5 doctors and 10 nurses. 这个队由5名医生和10名护士组成。 【拓展】make up 组成，构成，形成 Women students make up 56% of the student numbers. 女生占学生人数的56%。
课堂作业 1. Remember the new words and expressions learnt in this lesson. 2. Describe the experiment to your friends.3. Preview Lesson 27.
板书设计 UNIT 5 Look into ScienceLesson 26: Keep the Candle Burningmatch, holder, shallow, lighter, examine, oxygen1. 短语：use upbe made up of 2. 描述实验过程
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