人教版高中英语 必修二 Unit3 《Computers---Warming up 》 课件 (共29张PPT).ppt

1、Are you familiar with the following things?abacusabacus bks The abacus played a very importantpart in calculating in ancient China.calculate klkjulet calculator klkjlet The calculator is widely usedin business and finance.financefannshuge computerIt was built to solve some mathematical problems.math

2、ematical,mmtkl solve slv PC A PC is a personal computer which can solve all kinds of problems and is widely used now.personal computerlaptoplaptoplptp /notebook computerA laptop can be taken conveniently like a notebook.PDAPersonal digital assistant.PDAs can store information,send and receive emails

3、,and connect to the Internet.ddt()lPDAabacuscalculatorhuge computerPClaptopWhats next?2)Can you work out the mind map(思维导图)of the development of computers?robotWhats next?Like a piece of“paper”Like a“handbag”like a nightstoollike a ring,Reading1.In the passage,“I”refers to _.2.the topic sentence of

4、each paragraph.Paragraph 1:paragraph 2:paragraph 3:So the whole passage is mainly about_.step 1 Fast-readinga computer Over time I have been changedquite a lot.These changes only became possible as my memory improved.Since the 1970s many newapplications have been found for me.the development of comp

5、uters.Read the text quickly and finish the following exercises:step 2 careful-readingScan the text and find more information about computers.Then fill in the two forms below.164219361940s1970snowThe computer _ _ _ _ machine1822Alan Turing _ _ _ _ how computers could be made to workComputers had _ _

6、_ _ a room.1960sFirst as _ _and then _ _ _ computers were used in _ and _.the computer connects people all over the world together as a devoted _ and _.A family of computers was connected by a_.The _ machine was made by Charles Babbage.began as a calculatinganalyticalwrote a book aboutgrown as large

7、 asa PCas a laptopnetworkofficeshomesfriendhelperFrom the above form,we can know that the text is written in an order of _.timeThe writing style of this passage is _.expository说明文read and fill in the blanks to learn about how the computer has changed over time.Paragraph 1step 3 Careful ReadingEarly

8、days(paragraph1)Name Function(功能)a 1._machine2._ difficult sumsan 3._machinethink 4._a 5._machine solve difficult 6._ _ Analytical logically universalmathematical problems calculating simplifysizelargesmallerPClaptopRead Paragraph 2 and 3carefully and fill in the blanks to learn about the memory and

9、 the applications of the computer.Paragraph 2 and 3network times(paragraph2 and 3)6._my memorytubes7._transistorssmall chipssince the 1970s 8._have been found in many fields(领域).9._;finance;10._;robots;mobile phones;11._;space rocketsapplicationscommunicationtrademedical operationsstep 4 post Readin

10、gActivity1:summaryActivity2:discussion It began as a _ machine in 1642 in France.In 1822 it was built as an _ machine.Then in 1936 Alan Turing wrote a book and built a _ machine.As time_ _,it was made smaller but its memory grew _ and _.In the 1960s they gave it a family connected by a _.Now people

11、call it the Internet.It was used in _ and _ since the 1970s.Since its birth it has truly been built to help the _ _.calculatinganalyticaluniversalwent bylargerlargernetworkofficeshomesSummaryhuman raceGroup work:Lets have a discussion.(2m)(1)What are the disadvantages of computers?(2)What attitude s

12、hould we have towards computers?AdvantagesWe can use the computers to1.watch movies;2.listen to the music;3.search for information;municate with others;5.go shopping on line;6.read books and magazines;7.send emails to friends;8.download music and films;9.draw picturesDisadvantages We may,1.get too a

13、ddicted(沉溺于)to it 2.abandon(沉迷于)themselves to the computer games3.waste too much time in playing computer games4.be cheated(欺骗)by someone on line5.leak our private information Every coin has two sides.We should make good use of it to bring us benefits instead of something bad.Thankyou foryour listening!