(课件网) Unit 3 Computers Should high school students surf the Internet(上网) What are advantages and disadvantages of the internet or Advantages Disadvantages Debate 网上读书方便经济， 查找资料有利学习。 购物淘宝娱乐游戏， 开阔眼界丰富知识。一旦着迷受害无比， 智力受阻精神疲惫。 上网时间科学调配， 时间太久损伤视力。 接触网络定要注意， 不要浏览不良信息。 不去玩耍暴力游戏， 与人聊天学会自卫。 网上交友纯属骗局， 即伤感情又伤心理。 健康成长放在首位， 科学上网终身受益。 自律自爱不被网累， 网络生活利定大弊。 Reading Fast-reading Go through the text quickly and find the topic sentence of each paragraph. Paragraph 1 Paragraph 2 Paragraph 3 Careful reading The first clue Over time I have been changed a lot. Paragraph 1 1642 1822 1936 1940s 1960s 1970s now I began as a calculating machine. I had grown as large as a room. I have been used in offices and homes. They gave me a family connected by a network. I was built as an analytical machine by Charles Babbage. I grew rapidly both in size and in brainpower. I connect people all over the world together. The second clue Paragraph 2 These changes only became possible as my memory improved. tubes A transistors B chips C network D It was stored World Wide Web E The third clue Since the 1970s many new applications have been found for me. Paragraph 3 finance 2 trade 3 robots 4 mobile phones 5 medical operations 6 space rockets 7 new applications 1 communications Who am I keyboard 键盘 mouse 鼠标 monitor 显示器 screen 屏幕 speaker 音响 host 主机 A computer Summary Name : computer Born : (time)_____ (place) _____ My real father: _____ My size: 1._____( in the past) 2._____(modern) My history: 1. 1642 _____machine 2. 1822_____machine 3. 1936 _____machine 4. 1940s _____ 5. 1970s _____ and _____ My memory: _____ _____ _____ My applications: _____; _____; _____; _____; _____; _____; _____. 1642 France Alan Turing huge smaller and smaller analytical calculating universal laptop PC tubes transistors chips communication finance robot mobile phone space rocket medical operation trade huge computer Homework 1. Read the text after class and look for more information about the development of the computer and its applications. 2. Retell the passage. Download(下载) information See a movie or watch TV Play computer games Buy goods you want Do some chatting advantages Improve people's ability of thinking Too expensive Addicted to（沉迷）playing games disadvantages People can’t write right Chinese letters Not a real world It is bad for our eyes Some students waste too much time in playing computer games. As a result, they have little time to study. tube transistor chip
