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Unit 3Computers A handbag?A toy girl? keyboard 键盘mouse 鼠标monitor 显示器screen 屏幕speaker 音响host 主机components ( 组件 ) of a computer I am very old now. I was born in China. Many people used me for calculating in the past, but now I am a bit lonely because they don’t like me now. Do you know who I am?abacusRiddles ( 谜语 ) I am very small. I can be used for calculating. In China, a lot of students use me when solving mathematical problems. calculator I am very big. Early Scientists used me to solve some mathematical problems. huge computer PC Personal ComputerI’m a small, relatively inexpensive computer designed for an individual( 个人的） user. At home, people use me to surf the Internet and play games. • I am a kind of computer and can be carried around conveniently like a notebook.A notebook computer/ A laptop PDA Personal Digital AssistantI am so small in size that I can fit in your hand. I usually have a small screen usually bigger than a digital phone, however smaller than the smallest laptop, I’m a great way to store telephone numbers, access the internet, make calculations, and so on. robotI’m a machine that works automatically( 自动地） . I can do a wide variety of tasks, especially suitable for doing jobs too boring, difficult,or dangerous for human beings. 1. They can be used for calculating. 2. They can deal with maths problems.3. They are useful and helpful.In pairs discuss what they have in common.Discussion Skimming to get general ideasThis passage is about _________________________.the development of computers1.In what order is this passage arranged( 安排） ? 2.Which type does the text belong to ?3.What kind of literary devices ( 修辞 )does the text use? ...