人教版必修二unit3课件

1、Unit 3 Computers Guessing game 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)I am very small. I can be used for calculating. In China, a lot of students use me w

2、hen solving mathematical problems. Do you know who I am?calculator With the development of science and technology, many new things appear in human beings life.Lets guess what they are:1. With me you can watch different programmes just at home. Im a machine that has a screen with moving pictures and

3、sounds. But watching me too much is bad for your eyes. TV set Who Am I 2. I am a machine which moves very fast on four wheels. You need a license(执照) and must be very careful when you drive me. Rolls Royce, Benz and BMW are some famous kinds of me. car3. I am a machine which is a good helper in doin

4、g house work. I wash clothes for people. Who am I?washing machine4. A machine that you use to talk to other people even in a far-away place. We are connected .Now each of us often has a number. Who am I?telephonePDA Personal Digital AssistantI am so small in size that I can fit in your hand. I usual

5、ly 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?5.It is a machine, which you can use to type your homework, draw pictures, play gam

6、es, watch movies, listen to music, communicate with your friends, gather information ComputerWhat English words do you know about computers?What is it in English?mouse鼠标What is it in English?CPU (central processing Unit)中央处理器What is it in English?Main board(主板)What is it in English?Display /Monitork

7、eyboardmousescannerprinterspeakerDo you know in what ways computers are used today? Work out a list and compare it with your partner.search for see movieslisten to musicread books and magazinessend emails to friendsdownload music and filmsbuy things on lineplay games on the computerdraw pictureslook

8、 at photographs on the computeruse a computer for school worktake part in chat groupsAsk and answer questions in pairs.1. use computer for school workYouYour partner2. play games on the computer3. send emails to friends4. surf the Web for fun5. download music and films6. chat online7. search for inf

9、ormation 8. look at photographs9. do shopping onlineHow do you use computers and the Internet? Write out all the words you know about putermonitorclicksoftwaresearchupdatedownloadInternetkeyboardTalk freelyDifferent attitudes towards computers.parentsschoolstudents advantages we cancommunicate with

10、friends listen to the music see films & watch news play games do shopping save a lot of time do a lot of useful things DisadvantagesSome people especially the teenagers abandon (沉迷于) themselves to the computer games and chatting on the Internet. As a result, they have little time to study .Some peop

11、le use the computer wrongly 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.SkimmingReading Com

12、prehension I16421822The analytical machine was made by Charles Babbage.The computer began as a calculating machine1936The computer grew rapidly both in size and in brainpower.Finish the timeline below.ScanningReading Comprehension II1940sThe first family of computers was connected to each other.1970

13、s Now1960sComputers were used in offices and homes.Computers connect people all over the world together.The computer had grown as large as a room.TimelineThe computer began as a calculating machineThe computer grew rapidly both in size and in brainpower.The computer had grown as large as a room.1960

14、sComputers were used in offices and homes.Computers connect people all over the world together.1642:_1822:The Analytical Machine was made by Charles Babbage.1936:_ _1940s:_: The first family of computers was connected to each other. 1970s:_Now:_These changes only became possible as my memory improve

15、d.Since the 1970s many new applications have been found for me.Over time I have been changed quite a lot.Para 1:Para 2:Para 3:Match the main ideas and the paragraphs.Reading Comprehension IIIComplete the chart below. Para-graph 1Para-graph 2Para-graph 3Topic sentenceSupporting detailstubescommunica-

16、tions financeScanningReading ComprehensionParagraph 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

17、 tubes2 transistors3 chips4 network5 World Wide WebParagraph 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 qualityChanges of the mac

18、hineCalculating machineAnalytical machineUniversal machineMachine with artificial intelligenceMachine with new transistorA family connected by a networkA family used by the InternetretellBrainstorm a list of things that you, your school and your familyuse computers for.Think about what you wouldhave

19、 to do if you could not usecomputers any more.Discussion Period 2Learning about languageFill the word or expression for each of the following meanings from the text.1 _ complete change in ways of thinking, working, etc2 _ connected computer system3 _ to make things easierrevolutionnetworksimplifyLea

20、rning about Laguage4 _ to find the answer using numbers5 _can be moved easily from place to place6 _ to work out the answer to a problem7 _to travel around an area to find out about itcalculatemobilesolveexplore8 _ completely9 _ anyway10 _ activity of managing moneytotallyanyhowfinanceComplete the p

21、assage with the words below.artificial technology intelligent applications explore Web reality logicallyMy brother was very interested in computers and enjoyed writing programs of his own. He used to download information from the Internet and madegood use of it. He liked to _ the World Wide _ and us

22、ed the Internet to communicate with computer programmers all over the world. When he went to university he studied IT (information _)and developed a special in _exploreWebtechnologyartificialintelligence. After developing special _of the computer, he hopes to design an _ robot which can think _ and

23、look like human being, but in _ he was a long way to go.logicallyapplicationsintelligentreality calculate vt. work (sth.) out by using numbers 计算e.g. calculate the cost of sth.calculator n. 计算器Language points2. universal adj. existing everywhere or involving everyone普遍的；通用的；宇宙的 universal rules 一般的原则

24、universe n. 宇宙; 万有; 世界; 全人类Our world is but a small part of theuniverse. 我们的世界只是宇宙的一小部分。 3. simplify vt to make something less complicated and therefore easier to do or understand 简化 The English in this story has been simplified to make it easier to understand. 这个故事里的英语被简写了，可更 容易理解。4. logical adj. 合

25、逻辑的；合清理的 a logical thinker 思想有逻辑性的人 a logical process 合理的程序 logically adv. 逻辑上； 有条理地He acted logically under the circumstances.在这种情况下他做事仍然很理智。 Logically, the decision is obvious. 从逻辑上，这项决定是明显的。 5. technologytechnique (n.) technologist (person) technical (adj.)technological (adj.)1) This company is i

26、n great need of many _. 2) To build this machine, you must have _ability. 3) Do you know the knowledge of agricultural _.technologiststechnicaltechnique6. artificial adj. 人造的; 假的 artificial flowers / limbs / pearls 假花 / 假肢 / 假珍珠 artificial intelligence 人工智能7. intelligence noun U the ability to learn

27、, understandand make judgments or have opinionsthat are based on reason. 智力；聪明intelligence quotient 智商an intelligence test 智力测验an intelligence agent 情报员; 谍报员intelligent adj. 智能的；聪明的an intelligent reader 理解力强的读者an intelligent being 有智力的动物intelligent reply 巧妙的答复He is an intelligent person.他是一位有才智的人。 8

28、. solvevt. 解决；解答1) I cant solve the problem. 我解答不了这个难题。 2) Help me to solve my financial troubles.请帮我解决经济困难. 3) The greatest scholar cannot solve this difficult problem. 再伟大的学者也没有办法解答这个难题吧。 9. fromon 从时起From then on, the prince andprincess lived happily.从那时起，王子与公主就幸福地生活在一起。10. as a result 结果1) He di

29、dnt work hard, as a result he failed his exam. 他不用功, 结果考试不及格。 2) Five hundred jobs were axed as a result of government spending cuts. 由于政府缩减经费的缘故, 有五百人被突然解雇了。 3) He was late as a result of the snow. 由于大雪他迟到了。 11. so that 如此以致于与 tooto 句型的相互转换e.g. He is so old that he cant carry the box. He is too old

30、 to carry the box. 此结构中的that从句表示结果。 The stone is so heavy that no one can lift it. 比较: so that 既能表结果，也能表目的。 so.that.结构的so+形容词/副词位于句 首时，句子用倒装结构。 So hard does he work that he seldom goes home.12. explore vt. & vi. 探索；探测；探究1) The experts are exploring every part of the island. 专家们正在勘查这个岛的各个部分。 2) He ha

31、d an itch to get away and explore. 他等不及要动身去探险。 3) Can you explore the market possibility for us? 您能为我们考察一下市场前景吗？ 13. anyhowadv. 无论如何；即使如此；至少1) I couldnt think of the name of that man anyhow. 我怎么也想不出那人的名字来了。 2) Anyhow, you can try. 至少你可以试试。 3) Anyhow I must tell the truth. 无论如何，我必须说出真相。 14. goal n. 目

32、标；目的；球门 ones goal in life 生活的目标 a common goal 一个共同的目标 keep goal 守球门 win by two goals 以两球获胜 He achieved his goal. 他达到了他的目标。 He kicked a goal. 他踢进一球。 15. human race 人类1) Is the human race threatened with complete extinction? 人类是否会受到完全灭绝的威胁呢？ 2) Everything you say seems to be pervaded with a mistrust o

33、f the human race. 你说的一切似乎都渗透了对人类的不信任。 Difficult sentences analysisI am now truly filled with happiness that I am a devoted friend and helperof the human race! S. P.我现在充满了幸福感，成了人类的好朋友好帮手！同位语从句O.Adv.The Present Perfect Passive VoiceGrammar现在完成时的被动语态表示动作发生在过去, 到现在已经完成或对现在仍有影响。 现在完成时的被动语态Understanding t

34、he structure of the present perfect passive voiceThe structure of the present perfect passive voice is: have / has beened 主动语态即主语为动作的执行者；被动语态即主语为动作的承受者。现在完成时的被动语态同它的主动语态一样，强调过去的动作对现在造成的影响或结果，但主语为动作的承受者，表示“已经被”。The new school has been set up. 新学校已经建成了。2. 现在完成时被动语态的肯定式为： have / has + been + doneThe ex

35、periment has been done successfully. 这个实验做得很成功。现在完成时被动语态的否定式为：have / has + not + been + doneToms novel has not been published. 汤姆的小说还没有被出版。现在完成时被动语态的一般疑问句需将have / has提到主语的前面。Has his bike been repaired? 他的自行车修好了吗？现在完成时被动语态的特殊疑问句为：疑问词 + have / has + been + doneWho has been invited? 谁受到了邀请？现在完成时的被动语态表达

36、以下两个概念：1. 说话时已经完成的动作或出现的结果。2. 主语是行为动作的承受者。现在完成时的被动语态由have/has beenv-ed构成，其中v-ed为过去分词，表示被动。I have been told about it many timesThe bridge has just been built在使用现在完成时的被动语态时要注意以下两点：1. 过去分词前有两个助动词： have / has和been。2. 必须表示被动。 注意: 副词的位置 often, usually, always, never, hardly, seldom等副词置于have / has和been中间。如

37、: 误 Such a man has been hardly believed. 正 Such a man has hardly been believed.2. 并不是所有动词都有被动语态 happen, take place, break out, belong to, cost, last等不及物动词或词组无被 动语态。如： 误 Great changes have been taken place in China since 1978. 正 Great changes have taken place in China since 1978.(2) open, break, drop

38、等不强调动作发出 者时常用主动语态。3. 短语动词不可分割或省略其中的介词 或副词。如：The patients have been taken good care of.4. 一些特殊动词, 如borrow, finish, begin, buy, start, return, marry, open, join等构成的现在完成时的被动语态不能与表示一段时间的状语连用。若要表达相应的意思， 则需改换动词或时态。如：My brother has had (不能用has bought) this bike for almost four years.How long has this book

39、been bought?How long ago was this book bought?(1) 把主动语态的宾语变为被动语态的主语。(2) 把谓语变成被动结构 (be过去分词) (根据被动语态句子里的主语的人称和数，以及原来主动语态句子中动词的时态来决定be的形式)。主动语态变被动语态的方法(3) 把主动语态中的主语放在介词by之后作宾语, 将主格改为宾格。 All the people laughed at him. He was laughed at by all the people. They make the bikes in the factory. The bikes are

40、 made by them in the factory.(4) 双宾语动词变被动语态可将其中的一个宾语变为主语， 另一个保留不动。主动：I have given him the key.被动：He has been given the key.被动：The key has been given (to) him.(5) 带复合宾语的动词变被动语态时, 只能将宾语变为主语, 原来的宾补保留不动， 改称主语补足语。主动：I have asked her to help you.被动：She has been asked to help you. 1. When and where to go f

41、or the on-salary holiday _ yet. A. are not decided B. have not been decided C. is not being decided D. has not been decided单选 2. Every possible means _ to prevent the air pollution, but the sky is still not clear. A. is used B. are used C. has been used D. have been used 3. All the preparations for

42、the task _ and were ready to start. A. completed B. complete C. had been completed D. have been completed 4. Some new oilfields _ since 1976. A. were opened up B. has opened up C. have been opened up D. had been opened up 5. The silence of the library _ only by the sound of pages being turned over.

43、A. has been broken B. breaks C. broke D. was broken 6. _ the sports meet might be put off. Yes, it all depends on the weather. A. Ive been told B. Ive told C. Im told D. I toldTurn the following into the Passive Voice.1. We have planted some trees around the lake.2. My father has locked the door.3. Someone has turned off the light. Some tre