高中英语必修二第三单元课件.ppt

Unit 3 Computers单元课件（人教课标必修2）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 dont like me now.Do you know who I am?abacusRiddles(谜语谜语)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?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.Im based on the microprocessor technology.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?PDAabacuscalculatorhuge computerPClaptopWhats next?Can you tell the development of computers?robotWHO AM I?ReadingSkimming to get main idea1.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.SkimmingReading Comprehension IScanning to get detail information1.Who was the first person to make the earliest computer?A.Alan Turing.B.Charles Babbage.C.Charles Turing.D.Alan Babbage.2.When was the“universal machine”built?A.In 1822.B.In 1642.C.In 1936.D.In 1970.ScanningReading Comprehension 3.When was the computer the biggest?A.In 1642.B.In 1936.C.In the 1940s.D.In the 1970s.4.How old is the computer?A.About 170 years old.B.About 270 years old.C.About 370 years old D.About 470 years old.Scanning5.Which of the following is in the right order of time?a.The computer was connected with other computers.b.Alan Turing wrote a book about the computer.c.The computer has been sent to explore the Moon and Mars.d.The computer began to simplify difficult sums.A.a.b.c.d.B.b.c.a.d.C.d.a.c.b.D.d.b.a.c.ScanningCareful reading to solve difficult pointstimeline1642:1822:1936:1940s:1960s:1970s:Now:Scanning:The computer began as a calculating machine.the Analytical Machine was built by Charles Babbage.The computer grew rapidly both in size and in brainpower.Computer had grown as large as a room.Computers were used in offices and homes.Computers connect people all over the world together.The first family of computers was connected to each other Paragraph 1Topic sentenceOver time I have been changed quite a lot.Supporting details1 calculating machine2 analytical machine3 universal machine4 PC5 laptopParagraph 2Topic sentenceThese changes only became possible as my memory improved.Supporting details1 tubes2 transistors3 chips4 network5 World Wide WebDo you know in what ways computers are used today?search for see movieslisten to musicread books and magazinessend emails to friendsdownload music and filmsbuy things on lineplay games on the computerdraw pictureslook at photographs on the computerCareful reading to solve difficult pointsParagraph 3Topic sentenceSince the 1970s many new applications have been found for me.Supporting details1 communications 2 finance 3 trade4 robots 5 mobile phones6 medical operations7 space rockets8 providing a life of high quality1.My real father was Charles Babbage,who wrote a book and built me in 1936.2.I was brought into peoples homes in the 1970s.3.Since my birth I have been built to take the place of the human race.True or FalseTest4.I began as a calculating machine in Japan in 1642.5.In 1936,I grew rapidly both in size and in brainpower.6.As time went by,I was made bigger.7.Since the 1970s many new applications have been found for me.TestI began as a _ _ in 1642 in France.In 1822 I was built as an_ _.Then in 1936 Alan Turing wrote a book and built a _ _.As the years have gone by,I have been made _ and _ but I became _ and _.calculating machineanalytical machinemachineuniversalsmallersmallerclevererquickerIn the _ they gave me a family connected by a _.Now people call it the Internet.I have been used in _ and _ since the 1970s.So I became PC.Since my _ I have truly been built to serve the _ _.network1960s human raceofficeshomesbirthHomework1.Read the text after class and look for more information about the development and use of the computer and its applications.2.Retell the passage.