约2160字。

　　仁爱版九年级上Unit 4
　　Topic 2  When was it invented?
　　Section B
　　The main activities are 1a and 3a. 本课重点活动是1a和3a。
　　Ⅰ. Teaching aims and demands 教学目标
　　1. Learn some new words:
　　clone, experiment
　　2. Go on learning the simple past passive voice:
　　(1) Do you know when it was invented?
　　(2) It was invented in 1879.
　　3. Learn some information about the clone technology.
　　(1) Cloning is famous throughout the world.
　　(2) There is DNA in most living things, including human beings.
　　(3) No doubt cloning can help save those animals in danger.
　　(4) And it can also benefit human beings.
　　Ⅱ. Teaching aids 教具
　　录音机/多媒体课件/图片
　　Ⅲ. Five-finger Teaching Plan
　　Step 1  Review
　　做游戏，复习一般过去时被动语态的用法，导入新课。
　　1. (用上节课的作业做一个链式游戏，以小组为单位，就计算机、MP3、CD、手机、数码相机或学习用具等进行对话，操练be made of / be made in / be made from / be used for的用法。让每一小组的第一个同学回过头去问下一位同学，依次接着往下问。)
　　T: Boys and girls. Let’s play a game. Asestions one by one.
　　S1: What’s your favorite invention?
　　S2: An MP3. What’s it made of?
　　S3: It’s made of steel and plastic. When was it developed?
　　S4: It was developed around 1998. What’s it used for?
　　S5: It’s used for helping us to improve our English.
　　…
　　2. (用多媒体出示图片，导入新课。)
　　T:  You did very well. There are many important technologies and inventions in the world today. Look at this invention. (展示灯泡图片。)It’s a bulb. Do you know about it?
　　(板书并要求学生了解。)
　　bulb
　　Ss: Yes, a little.
　　T: OK, who invented it?
　　Ss: Thomas Edison.
　　T: When was the light bulb invented? Do you know?
　　Ss: No.
　　T: OK, let’s come to 1a and learn about it.