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Unit 5　Look into Science
教学课题 Lesson 25　Let's Do an Experiment! 备注
教学目标 【知识目标】 Important words: experiment,jar,upside,pour,correct,scientific,method,raincoat,force,pressure,conclude Important phrases: turn...upside down,pour out,scientific method,take...off Important sentences: (1)Then I turn the jar upside down and take my hand off the cardboard. (2)That's called the scientific method. (3)I am so sure of my theory that Brian can do the experiment over your head and I know you won't get wet. (4)The force of the air keeps the water in the jar. (5)It is strong enough to hold the water. 【能力目标】 能够运用所学知识介绍自己做实验的过程。 【情感目标】 激发学生对科学探索的求知欲。
教学 重难点 重点:1.本课单词和句型; 2.定语从句; 3.能够复述实验。 难点:1.能够确定定语从句的先行词和关系词; 2.能够让学生运用所学知识介绍自己做实验的过程。
教学过程
◆Step 1　Lead in 1.The teacher brings a jar,a cardboard and water to the class. 2.Show students the pictures on PPT. T:What experiments have you done S:We have done... T:Look at the pictures.There are some experiments we did in science class. Let's do an experiment. Then show the materials to the students and tell the students how to do it.(见课件) T:Guess,what will happen (见课件) 设计意图:教师拿出与课文中的实验相关的教具,导入新课,为课文的学习奠定基础。
◆Step 2　Show learning aims. Let the students read the learning aims together.(见课件) ◆Step 3　Learn the new words and expressions. 设计意图:让学生在学习本课时之前,了解本节课的学习目标以及需掌握的单词短语。
◆Step 4　Listening Listen to the lesson and answer the following questions. 1.What's Danny's theory
续表
2.What's Jenny's theory 3.What does Danny conclude 【Keys】 1.Danny thinks the floor will get wet. 2.Jenny thinks the water will stay in the jar. 3.Danny concludes that air is stronger than he thought. ◆Step 5　Reading 1.Read the lesson and answer the questions.(见课本P67 Let's Do It!1) (1)Where does Danny think they should do the experiment (2)What keeps the water in the jar (3)Is Jenny sure of her theory How do you know (4)Why does Danny put on his raincoat (5)What does Danny conclude 【Keys】 (1)Danny thinks that they should do the experiment outside. (2)The force of the air./The air pressure. (3)Yes,she is.She is so sure of her theory that she thinks Brian can do the experiment over Danny's head and he won't get wet. (4)Because he thinks he will get wet. (5)Air is stronger than he thought. 2.Read the experiment.Put the sentences in the correct order.(见课本P67 Let's Do It!2) Put a piece of cardboard over the jar. The jar of water is upside down,but the water stays in the jar.This is because air pressure pushes the cardboard onto the jar. Fill the glass jar with water. Turn the glass jar over quickly.Hold your hand on the cardboard for a few seconds. Remove your hand from underneath the jar.What happens There is more air outside the jar than inside,so there is more air pressure outside than inside. 【Keys】 2　5　1　3　4　6 设计意图:让学生阅读课文,概括文章大意,加深对课文的理解。
◆Step 6　Language points 1.fill...with...用……装满…… He has filled his case with many books. cover...with...用……盖住…… I cover the top with a piece of cardboard. 2.upside down向下翻转过来 You hold the book upside down.你把书拿倒了。 right side up正面朝上 3.be sure表示肯定,有把握;而be not sure 表示不确定。 be sure/be not sure后可接句子,还可接代词、名词、动名词或不定式。 常见用法:be sure of sth., be sure of (doing) sth., be sure to do sth., be sure that... 4.take...off...意为“把……从……拿开”。 Please take your hand off the food. take off摘掉,脱掉;起飞 When will the plane take off 设计意图:让学生掌握本课重要知识点。
续表
5.enough 的用法 enough 与修饰词的排列顺序: (1)作形容词时,置于名词前后均可; (2)作副词时,置于所修饰的形容词、副词之后。 enough to do sth.常与too...to或so...that进行句型转换。 Tom isn't old enough to go to school. →Tom is too young to go to school. →Tom is so young that he can't go to school.
◆Blackboard design Lesson 25 重点单词:experiment,jar,upside,pour,correct,scientific,method,raincoat,force,pressure,conclude 重点词组:turn...upside down,pour out,scientific method,take...off 重点句式: (1)Then I turn the jar upside down and take my hand off the cardboard. (2)That's called the scientific method. (3)I am so sure of my theory that Brian can do the experiment over your head and I know you won't get wet. (4)The force of the air keeps the water in the jar. (5)It is strong enough to hold the water. 设计意图:让学生通过总结,对这一实验的设计及结果更加明确。
◆Step 7　Exercises Ⅰ.用括号内所给单词的适当形式填空 1.He locked the door 　　　(careful) before he left. 2.Let's 　　　(finish) the work together now. 3.Can you guess what 　　　(happen) in 100 years 4.What's another way of 　　　(say)“autumn” Ⅱ.根据汉语意思完成句子 1.我确信你是一个诚实的人。 I 　　　 　　　 that you are an honest man. 2.请用一块玻璃盖上那个杯子。 Please 　　　 the cup 　　　 a piece of glass. 3.小心,否则你会弄湿的。 Be careful,or you'll 　　　 　　　. 4.把箱子倒过来,你会找到标签的。 　　　 the box 　　　 　　　,then you'll find the label. 【Keys】Ⅰ.1.carefully　2.finish　3.will happen　4.saying Ⅱ.1.am sure　2.cover;with　3.get wet　4.Turn;upside down 设计意图:通过练习,让学生巩固本课时知识点。
◆Step 8　Homework 1.Preview the words and expressions in Lesson 26. 2.Finish the exercises of this lesson.
教学反思

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