英语科必修二unit-3-computers-warming-up-课件.ppt--（课件中不含音视频）

1、1.Words about computers2.History of development of computers3.Comparison among abacus,calculator,PC and PDA4.Speaking practice5.Summary on the advantages and disadvantages of using 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 lon

2、ely because they dont like me now.Do you know who I am?Do you know who I am?abacusGuess:Part 1 words I am very small.I can be used for calculating.In China,a lot of students use me when solving mathematical problems.Do you know who I am?Do you know who I am?calculatorIt is a machine,which you can us

3、e to type your homework,draw pictures,play games,watch movies,listen to music,communicate with your friends,gather information Who am I?ComputerPC it is a kind of computer which can be taken conveniently(方便地)like a notebook.A laptop CPU(central processing Unit)中央处理器中央处理器hard disc硬盘硬盘chips 主板主板 displ

4、ay card 显卡显卡monitor显示器显示器keyboard键盘键盘 mouse鼠标鼠标modemScanner扫描仪扫描仪printerSpeaker音箱音箱CD/DVD/VCDCD/DVD-ROM光盘驱动器光盘驱动器ScannerScannerPrinterPrinterMonitorMonitorMouseMouseSpeakerSpeaker 内存Random Access Memory 重置电脑组件What do they have in common?共同点共同点Whats next?abacuscalculator Huge computer desktoplaptopPD

5、A Robot Part2 HistoryDiscussion and competition Use words phrases to express the advantages(优点)and disadvantages(缺点)of abacus,calculator,PC,and PDA.(用单词,词组来表达abacus,calculator,PC,PDA的优点,缺点)discussion3+writing 5Part 3 Comparison AbacusAdvantages:fast,traditional,convenient,simple Disadvantages:too si

6、mpleCalculatorAdvantages:accurate(准确的),convenient,convenient to carry,more useful,has more functions,like cos,sin,log,etc Disadvantages:people will rely on it too much PCAdvantages:personal,popular,faster,intelligent,more useful usages functions,(surfing the Internet,looking for information,draw pic

7、tures)Disadvantages:too big to carry,expensive,skillful(it requires people should know how to use a computer)PDAAdvantages:compact(小巧的),useful,portable(轻便的,方便携带的),convenient to carryDisadvantages:the screen is too small,it needs battery(电池),.lose data(数据).Speaking practice If you decide to design(设计

8、)your own house,which one do you like to use to help your?abacus,calculator,PC,PDA?Give your reasons?Part 4Summary Discuss the advantages and disadvantages of using a computer with your partner?Part 5 Advantages:1.surf the Internet 2.look for information municate with others online 4.make friends al

9、l over the world 5.make free calls through QQ 6.watch films,videos.7.draw pictures 8.use Photoshop to make your photos more beautifuldisadvantages:1 bad information 2 bad for our health,especially bad for our eyes 3.spending too much on it will do harm to our games .bad for our study 5.reduce the time for real friends and family.Homework 1.Write a composition about advantages and disadvantages of using a computer.2.Preview the reading passage“who am I”.