公开课课件unit3-computers知识分享.ppt

公开课课件公开课课件unit3-unit3-computerscomputersI am very old now.I was born in ancient China.Many people used me for calculating in the past,but now I am a bit lonely because they dont like me now.Do you know who I am?Riddles(谜语谜语)abacusI 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?calculatorI am very big.Scientists use me to solve some mathematical problems.huge computerDo you know who I am?PC Personal ComputerIm a small,relatively inexpensive computer designed for an individual user.At home,people use me to surf the Internet and play games.Do you know who I am?I can be used for calculating.Besides,I can also be used for watching DVD,sending e-mail and communicating through the Internet.However,I am not a PC,because Im small enough for you to take me with you.Do you know who I am?laptopPDA 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,Im a great way to store telephone numbers,access the internet,make calculations,and so on.Do you know who I am?robotIm a machine that works automatically.I can do a wide variety of tasks,especially suitable for doing jobs too boring,difficult,or dangerous for human beings.Do you know who I am?I can do with a computerIf you have a computer,what would like to do most?cosplaysearch for see movieslisten to musicread books and magazinesdraw pictureslook at photographs on the computersend emails to friendsdownload music and filmsbuy things on lineplay games on the computerChatting onlinePlayinggamesWatching moviesSearching for informationproblemsShoppingListening to musicSending EmailsThe development of computersThe passage on page 18 will you more WHO AM I?Reading1.Who is the speaker in this story?2.Whats the main idea of this passage?A.The development of computers.B.The development and use of computers.C.A machine which is simple-minded.D.Computers may replace human beings.A computer.Skimming(3minutes)Reading Comprehension ITopic sentences123These changes only became possible These changes only became possible as my memory improved.as my memory improved.Since the 1970s many new Since the 1970s many new applications have been found for me.applications have been found for me.Para 1:Para 2:Para 3:Over time I have been changed quite a lot.16421822The analytical machine was made by Charles Babbage.The computer began as a calculating machine1936The computer grew rapidly both in size and in brainpower.1.Finish the timeline below.Scanning(5-8minutes)1940sThe first family of computers was connected to each other.1970s Now1960sComputers were used in offices and homes.Computers connect people all over the world together.The computer had grown as large as a room.Read the passage again.Find the topic sentence of each paragraph and the supporting details.Paragraph 1:Over time I have been changed quite a lot.1.calculating machine2.analytical machine3.universal machine4.laptopWhile-reading Paragraph 2:These changes only became possible as my memory improved.1.tubes 2.transistors 3.chips work 5.World Wide WebWhile-readingParagraph 3:Since the 1970s many new applications have been found for munications 2.finance 3.trade 4.robots 5.mobile phones 6.medical operations 7.space rockets 8.providing a life of high qualityWhile-readingabacushuge computerPCcalculatorlaptopPDAWhats next?What do they tell you about the development of computers?robotWhat are the advantages and disadvantages of the computers?DiscussionThe advantage/disadvantage is I think/dont think thatI thinkbecause of Lets decideAs/Since,I think I agree/dont agreebecauseFirst SecondI believe thatIve decided that Read the passage again.Underline the sentences that you do not understand and try to solve the problems using context clues and the dictionary.V.HomeworkL/O/G/OThank You!Thank You!结束结束