高中英語必修三 Unit 4 Period 3 Discovering Useful Structures課件

1、 Unit 4Space ExplorationPeriod 3Discovering Useful Structures人教版本 必修三Lead-inWhat Powers a Spacecraft?Spacecraft have instruments to help them take pictures and collect information in space. But they need electricity to power those instruments and send the information back to Earth. Where does the po

2、wer come from?Lead-inWhat Powers a Spacecraft?A spacecraft generally gets its energy from at least one of three power sources: the Sun, batteries or unstable atoms. To choose the best type of power for a spacecraft, engineers consider where it is traveling, what it plans to do there and how long it

3、will need to work.Lead-inHow many “to” in the text?Do you know their meanings and functions?New wordsThey charged the accident to the lack of experience.Please call before you come, otherwise we might not be home.or elsedifferentlyin other waysnot have sth.not have enough of sth.New wordsIt goes bey

4、ond our research.These materials can be recycled into other packaging products.Current success does not mean success in the future. save for reuseuse again differentlyreuse sth.pastexceptimpossible forexisting nowvalidflow of water or airNew wordsWe have provided sufficient information to you on thi

5、s issue. Let them figure out the answer without you.enoughwork sth. outdecideLets play看誰答的快又準！Lets play1.Be modest, _ you will lag behind. 2._ of food and supplies caused disaffection among the soldiers.3.They _ empty tins so as to use the metal. 4.The contents go far _ the title. 5.Even though they

6、 are a step in the right direction, our_ processes are not enough. 6.They had no evidence _ to hold him.7.Father is trying to figure _ his tax.otherwiseLackrecyclebeyondcurrentsufficientoutLets learnLook at the following sentences and focus on the italicized infinitives. In pairs, discuss their func

7、tions and meanings. I trained for a long time to fly airplanes as a fighter pilot.As we all know, an astronaut needs to be healthy and calm in order to work in space.First of all, you must be intelligent enough to get a related college degree.Some scientists were determined to help humans realize th

8、eir dream to explore space.On 12 April 1961, Yuri Gagarin became the first person in the world to go into space.Rewrite the sentences using infinitives or “in order to/so as to + do”. Change the italicized parts accordingly.In 2003 Yuri Malenchenko became the first person who got married in space.In

9、 2003 Yuri Malenchenko became the first person to get married in space.2. In space, astronauts collect all dirty water so that it can be recycled for later use.In space, astronauts collect all dirty water so as to recycle for later use.E.g.3. Mankind has always been curious about the universe and ma

10、ny people, have dreamt that one day they would fly into space.Mankind has always been curious about the universe and many people to dream that one day they would fly into space.4. Astronauts bones and muscles can get very weak in space due to the lack of gravity, so they need to exercise every day,

11、which will help them stay healthy.Astronauts bones and muscles can get very weak in space due to the lack of gravity, so they need to exercise every day in order to help them stay healthy.5. Astronauts have to use tape to stick everything down while working in space because everything would float of

12、f otherwise.Astronauts have to use tape to stick everything down to work in space because everything would float off otherwise.6. During a spacewalk, astronauts have to move slowly so that they can keep their bodies under control.During a spacewalk, astronauts have to move slowly so as to keep their

13、 bodies under control.Complete the passage with the correct forms of the verbs in brackets.Sending people to other planets or even beyond the solar system is not an easy goal _(achieve). One of the problems is that the trip would take over two years _(get) to the closest planet, Mars, and back. Alth

14、ough light is the fastest thing _(know) in the universe, it could take more than four years to reach the nearest star system. Will scientists figure out a way _(store) sufficient food and water for the long journey?to achieveto getto knowto storeComplete the passage with the correct forms of the ver

15、bs in brackets.Is it possible to travel faster than light? No one knows the answers yet. However, space scientists never give up. They are experimenting with growing crops in space so as _(help) astronauts get enough food on longer journeys through space.to helpInfinitives做主語不定式置于句首To get there by b

16、ike will take us half an hour.To make up for lost time is not possible.To lean out of the window is dangerous.To save money now seems impossible.用it作形式主語，把真正的主語不定式置于句后Its our duty to take good care of the old. How long did it take you to finish the work? It seemed impossible to save money.作賓語I happe

17、n to know the answer to your question.The question is how to put it into practice.I find it difficult to learn English well.作補語Father will not allow us to play on the street.We believe him to be guilty.The book is believed to be uninteresting.to seeThe driver failed _(see) the other car in time.He f

18、eels it his duty _(help) the poor.It is difficult for us _(finish) writing the composition in a quarter of an hour.Its a great honor _(invite) to Marys birthday party.There is nothing _(do) now.Practiceto helpto finishto be invitedto do作定語一般置于被修飾詞之后用作后置定語Scientists were determined to help humans rea

19、lize their dream to explore space.On 12 April 1961, Yuri Gagarin became the first person in the world to go into space.Sending people to other planets or even beyond the solar system is not an easy goal to achieve.Jessie got a new toy to play with.She has no friend to depend on.作狀語可以表示目的、結(jié)果或原因等Scien

20、tists work hard to find out the secrets of the universe.As we all know, an astronaut needs to be healthy and calm in order to work in space.You must be intelligent enough to get a related college degree.Im afraid the whole process is too complicate to explain in a few words.We were surprised to find

21、 that he had already left.the first Chinese astronaut to go into space.1. Q: Why is Yang Liwei famous in China?A: Because he is _（第一個進入太空的中國宇航員）Lets playtoo long and too boring to finish.2. Q: How do you feel about the film 2001: A Space Odssey?A: Im afraid the film is _（太長太乏味而無法看完）no longer to be s

22、afe to live.3. Q: Why was the Russian space station Mir(和平空間號) brought down out of orbit?A: One of the reasons is that Mir was too old and _（不再是安全的居所）Lets playthe first Chinese to step onto Mars.4. Q: Would you like to travel into space one day?A: Yes, and I want to become _（登錄火星的第一個中國人）too complex

23、to explain in a few words.5. Q: Could you provide a simple introduction to how space rockets work?A: Im afraid the whole process is _（太復雜了，無法用幾句話解釋清楚）Lets playDiscussionShare your ideas and your life with your patterner!DiscussionShare your idea!EXAMPLE:I think _ is too difficult/easy/complex/intere

24、sting to _.I think _ enough to _.I hope scientists will invent a _ to _.I think we need to find a _ to _.I _so as to _. 1. recycle vt.回收利用；再利用recycle bin 回收站internal recycle 內(nèi)部循環(huán)Language points塑料袋每年會導致100,000海洋動物死亡，因為這些動物常常把塑料袋誤當食物吞下去，因此，如果你一定要用塑料袋，一定要在超市垃圾箱回收塑料袋。Plastic bags cause the deaths of 100

25、, 000 Marine animals each year when the animals mistake them for food, so if you must use them, always recycle them in the bin at your supermarket.2. lack n.缺乏；短缺 vt.沒有；缺乏for lack of have no lack oflack sth. lack of faithLanguage points因缺乏;因缺少不缺乏；不缺少缺乏某物不信教，不信神ofThe flowers failed for lack _ rain.La

26、ck _ sleep blunted her thinking.They _ the force of conviction.Language pointsoflack3. otherwise adv.否則；要不然or otherwiseotherwise thanand otherwiseLanguage points或相反；或其反面不像；除外等等orOnly by saving will you have money in the bank _ otherwise invested.I know him otherwise _ in business. In the kindergarte

27、n, the children learn singing, dancing, drawing _ otherwise. Language pointsthanand不合理的；不理智的無法控制無容置疑無法達到；超出的能力之外4.beyond prep.在更遠處；超出Language points無與倫比出乎意料超出范圍beyond all reasonbeyond controlbeyond doubtbeyond the reach ofbeyond wordsbeyond challengebeyond expectationbeyond the scope ofbeyond難以言表老師教

28、我們超越我們原以為只能夠到達的地方。The teacher teaches us to push beyond where we thought we could go.You cannot judge any man beyond your knowledge of him, and how small is your knowledge.Language points你判斷一個人不可能超過你對他的了解，而你的了解又是多么膚淺。氣流上升氣流電池電流流動資產(chǎn)current adj.當前的；現(xiàn)在的 n.水流；電流；思潮Language pointsair currentascending air

29、 currentbattery currentcurrent assetcurrent在這個系統(tǒng)中，當前不存在任何瓶頸。There are no current bottlenecks at all on this system.Language points對足夠綽綽有余睡眠充足充要條件6.sufficient adj.足夠的，充足的Language pointsbe sufficient formore than sufficientsufficient sleepingnecessary and sufficient conditionsufficient一般說來，5天的課堂培訓對于一個

30、已熟悉企業(yè)開發(fā)環(huán)境的應(yīng)用程序開發(fā)者來講是足夠的。Typically, five days of classroom training is sufficient for application developers who are already familiar with enterprise application development.Language points你們將不得不和越來越多的精神疾病以及其他各種各樣的問題作斗爭。You will have to deal with higher rates of mental illness and every other kind of

31、 problem.He isnt a mental patient but he is always mental hospital, because he is a doctor.Language points他不是一名精神病人但他經(jīng)常在精神病醫(yī)院，因為他是一名醫(yī)生。7.figure out 弄懂；弄清楚；弄明白Language pointsMaybe well figure _ how to do something different.out計劃謀取，企圖獲得算進；包括進figure onfigure forfigure inExercise1.The space shuttle(航天飛機) was created as a reusable launch vehicle _astronauts and other equipment into space and back again. The shuttle looks like an ordinary plane but it has a cargo bay(貨倉) that is large enough _ a satellite.2.Space probes(航天探測器)