高一英语UNIT4reading课件新人教必修3

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1、Unit 4Astronomy:the science of the starsWarming up&readingTeaching aims:Enable students to improve their listening skills and reading ability.Enable students to understand the development of gravity and how gravity affects us in different times and places.Arouse students interest to search for the m

2、ystery of space.Emphasis:Words and expressions:gravity,float,cheer up,now that,break out,etcAstronomic knowledge like gravity and black hole.Warming up Think about these questions and then discuss them with your partner.1.In our solar system eight planets circle around the sun.What are they?Can you

3、match the names with the planets?2.What interests you in astronomy?Do you know any questions that astronomers are interested in?THE SOLAR SYSTEM Can you name each planet correctly using the letters given in the table below?A.地球地球 _B.木星木星 _C.火星火星 _D.水星水星 _E.海王星海王星 _F.冥王星冥王星 _G.土星土星 _H.天王星天王星 _I.金星金星

4、_EarthJupiterMarsMercuryNeptunePlutoSaturnUranusVenusPre-reading1.Do you know each religion or culture has its own ideas about the beginning of the universe?In China,we all know that Pangu separates the sky from the earth.Pangu separates the sky from the earth 中国神话传说中有盘古开天地的说法。中国神话传说中有盘古开天地的说法。巨人盘古用

5、一把利斧劈开混沌巨人盘古用一把利斧劈开混沌,将天地分开。将天地分开。死后死后,他的气息化成风和云他的气息化成风和云,声音变成轰轰的声音变成轰轰的雷声雷声,左眼化为太阳左眼化为太阳,右眼化为月亮右眼化为月亮,手足与四手足与四肢变成大地的四极与五方的名山肢变成大地的四极与五方的名山,血液化成血液化成江河江河,筋脉铺成道路筋脉铺成道路,肌肉形成田地肌肉形成田地,须发成为须发成为星星星星,牙齿和骨骼化为金属、珍珠、玉石牙齿和骨骼化为金属、珍珠、玉石,汗汗水成为滋润万物生长的甘霖和雨露。水成为滋润万物生长的甘霖和雨露。Other legends about the beginning of univer

6、seThe Biblical AccountDay 1:God spoke and separated light from darkness creating Day and Night Day 2:God spoke and separated the water creating sky and ocean Day 3:God spoke and created dry land Day 4:God spoke and created the sun,moon and stars Day 5:God spoke and created living creatures in the ai

7、r and sea Day 6:God spoke and created the land animals and man Day 7:God rested and blessed this day calling it Holy India Brahma is the god first represented in the Hindu Triad.He is the creator of the universe and all living beings are said to have evolved from him.2.Do you know what a scientific

8、idea is?It should be an idea coming from scientific theory.想一想想一想 HOW LIFE BEGAN ON THE EARTH?Reading1.Where do we come from?Or we can say:Who are our ancestors?2.Do you really think space flights are meaningful?3.Why is the earth the only one of all the plants on which life can survive?Cooperative

9、learning海洋里的细胞开始分裂海洋里的细胞开始分裂 登陆登陆登陆登陆爬行动物爬行动物恐龙恐龙恐龙恐龙Mammals人类的兴起人类的兴起Do you know what it was like before life appeared on earth?可以演化成低级生命的小液滴;水泡状的太空原始生命体It was full of water.Big BangGasNew starsDying starsremnants平面图平面图1948年，美国物理学家伽莫夫提出了宇宙大爆炸年，美国物理学家伽莫夫提出了宇宙大爆炸学说。他认为：我们所观测到的宇宙始于学说。他认为：我们所观测到的宇宙始于15

10、0亿前的一亿前的一次爆炸事件。次爆炸事件。爆炸之初，宇宙是一个极度高温、高密度的爆炸之初，宇宙是一个极度高温、高密度的“辐辐射地狱射地狱”，物质只能以中子、质子、电子、光子和中微，物质只能以中子、质子、电子、光子和中微子等基本粒子形态存在。宇宙爆炸之后不断膨胀，导致子等基本粒子形态存在。宇宙爆炸之后不断膨胀，导致温度和密度很快下降。随着温度的下降，逐步形成原子温度和密度很快下降。随着温度的下降，逐步形成原子核、原子、分子，并复合成通常的气体。气体逐渐凝聚核、原子、分子，并复合成通常的气体。气体逐渐凝聚成星云，星云进一步形成各种各样的恒星和星系，形成成星云，星云进一步形成各种各样的恒星和星系，形

11、成现在我们所看到的宇宙。现在我们所看到的宇宙。宇宙大爆炸学说的主要证据宇宙大爆炸学说的主要证据(1)星系距离越远，退行速度越大（红移）星系距离越远，退行速度越大（红移）(2)3K宇宙微波背景辐射（宇宙微波背景辐射（1978年诺贝尔物理奖）年诺贝尔物理奖）(3)宇宙氦丰度（宇宙氦丰度（76%的氢和的氢和24%的氦）的氦）The Big BangThe Big Bang从从19481948年伽莫夫建立热大爆炸的观念以来，通过几年伽莫夫建立热大爆炸的观念以来，通过几十年的努力，为我们勾画出这样一部宇宙历史十年的努力，为我们勾画出这样一部宇宙历史：大爆炸开始时大爆炸开始时 150200亿年前，极小体积

12、，极高密亿年前，极小体积，极高密度，极高温度。度，极高温度。大爆炸后大爆炸后10-43秒秒 宇宙从量子背景出现。宇宙从量子背景出现。大爆炸后大爆炸后10-35秒秒 同一场分解为强力、电弱力和引同一场分解为强力、电弱力和引力。力。大爆炸后大爆炸后10-5秒秒 10万亿度，质子和中子形成。万亿度，质子和中子形成。大爆炸后大爆炸后0.01秒秒 1000亿度，光子、电子、中微子为亿度，光子、电子、中微子为主，质子中子仅占主，质子中子仅占10亿分之一，热平衡态，体系急亿分之一，热平衡态，体系急剧膨胀，温度和密度不断下降。剧膨胀，温度和密度不断下降。大爆炸后大爆炸后0.1秒后秒后 300亿度，中子质子比从

13、亿度，中子质子比从1.0下降到下降到0.61。大爆炸后大爆炸后1秒后秒后 100亿度，中微子向外逃逸，亿度，中微子向外逃逸，正负电子湮没反应出现，核力尚不足束缚中正负电子湮没反应出现，核力尚不足束缚中子和质子。子和质子。大爆炸后大爆炸后13.8秒后秒后 30亿度，氘、氦类稳定原亿度，氘、氦类稳定原子核（化学元素）形成。子核（化学元素）形成。大爆炸后大爆炸后35分钟后分钟后 3亿度，核过程停止，尚亿度，核过程停止，尚不能形成中性原子。不能形成中性原子。大爆炸后大爆炸后30万年后万年后 3000度，化学结合作用使度，化学结合作用使中性原子形成，宇宙主要成分为气态物质，中性原子形成，宇宙主要成分为气

14、态物质，并逐步在自引力作用下凝聚成密度较高的气并逐步在自引力作用下凝聚成密度较高的气体云块，直至恒星和恒星系统。体云块，直至恒星和恒星系统。ReadingScanning1.What was there on the earth before life could begin?Water vapour,carbon dioxide,oxygen,nitrogen and other gases.2.Why do scientists think there has never been life on the moon?Because there is no water on the moon

15、.3.Why did animals first appear in the seas?Because water allowed the earth to dissolve harmful gases into the oceans and seas.4.Why did green plants help life to develop?Because green plants can take carbon dioxide from the atmosphere and fill the air with oxygen.5.Why were mammals different from o

16、ther animals?They were different because they produced their young from within their bodies.Read the passage quickly and find out the answers to the questions below.1.Whats the main idea of the text?2.How many parts can the text be divided into?Whats the main idea for each part?1.Whats the main idea

17、 of the text?How life began on the earth.2.How many parts can the text be divided into?Two parts:Part 1(para 1)Part 2(para2.3.4)Water made it possible for life begin to develop.The development of living things.Fill in the blanks with the proper words:After the_,the earth was a cloud of_.Later the du

18、st began to_ Into_.And then it _ loudly with fireand rock,which were in time to _ the water vapour,carbon dioxide,which were tomake the earths_.As the earth _ down,_ began to _ on its surface.Water had _ from planets orsatellites,but it _on the earth.That madeit possible for life to begin to _.energ

19、etic dustcombineexplodedproducecooledappear disappearedstayed develop“Big Bang”a ball atmospherewaterFill in the blanks with the proper verbs:The arrival of _ encouraged the _of early _.Many millions of years later _ began to appear_.Later _ appeared.Some were_.Others called _,were able to live on l

20、ands well as _.When the plants grew into forests,_appeared for the first time.After they disappeared,_became more important.They were the last group of animals different from because they _from within their bodies.development shellfish and all sorts of fish on land land animalsamphibians dinosaurs m

21、ammals produced small plants the fist green plants insects in the seaComprehending 1.Read the passage carefully and analyse its structure.Write down the main idea for each paragraph.(P27)A widely accepted theory about the formation of universeParagraph 1:The formation of the earth.Paragraph 2:The im

22、portance of water for life.Paragraph 3:The development of plants and animals on the earth.Paragraph 4:The arrival of humans and their impact on the earth.Paragraph 5:2.Put the order of development of life into a timeline.Use the reading passage to help you.10-7-3-8-4-9-6-1-5-2-12-113.Think about wha

23、t you have read and discuss these questions in pairs.1.Because the water remained on the earth.2.Because plants provide oxygen for animals to breathe.3.Because dinosaurs died out long before human beings developed on the earth.4.The name is Pluto.Scientists now think it is too small to be called a p

24、lants.5.Human beings caused global warming.1.The earth became violent because it was not clear whether the solid shape was to last or not.whether可以引导主语从句、表语从句、可以引导主语从句、表语从句、宾语从句和同位语从句宾语从句和同位语从句;而而if只能引导宾只能引导宾语从句。语从句。Explanation1)引导宾语从句既可以用引导宾语从句既可以用whether,也可以用也可以用if,两者常可以互换。两者常可以互换。He asked me whet

25、her/if I could lend him my bike.Could you tell us whether/if it snows in winter in Australia?值得注意的是值得注意的是：whether 和和if都可以和都可以和or not连用连用,但是但是whether之后可以直接跟之后可以直接跟or not,而而if则不能则不能,如：如：I dont care whether or not your car breaks down.I dont know whether or not hes coming.但是不可以说：但是不可以说：I dont care if o

26、r not your car breaks down.whether引导的从句一般不可以为引导的从句一般不可以为否定结构否定结构(选择问句的后一部分除选择问句的后一部分除外外);而而if则可以跟否定结构则可以跟否定结构,如如:I dont care if she doesnt come.I dont care if it doesnt rain.但是但是,在某些动词或形容词之后在某些动词或形容词之后,则则可以用可以用whether引导一个否定结构的句引导一个否定结构的句子子,这种结构往往表示肯定的含义这种结构往往表示肯定的含义,如：如：I wonder whether he doesnt th

27、ink too much of himself.其意思相当于其意思相当于:I think he does think too much of himself.在个别动词之后在个别动词之后,如如discuss 等等,只跟只跟用用whether引导的宾语从句引导的宾语从句,如如:They discussed whether they should close the shop.We discussed whether Mary could join us.whether 可以引导从句作介词的可以引导从句作介词的宾语宾语,而而if则不能则不能,如：如：Im not interested in whe

28、ther theyll go or not.whether可以直接跟动词不定式可以直接跟动词不定式连用连用,而而if则不能则不能,如如:I didnt know whether to laugh or to cry.She hasnt decided whether to go or not.2)引导主语从句引导主语从句(包括从句在句首的位包括从句在句首的位置置)应当用应当用whether,不用不用if,如：如：Whether it is true remains a problem.Whether he will come,I am not sure.3)引导表语从句用引导表语从句用whet

29、her,不用不用if,如如:The question is whether you should accept it.The question is whether he will speak at the meeting.4)引导同位语从句用引导同位语从句用whether,不用不用if,如如:The question whether hell attend the meeting is essential.I am in doubt whether I should agree to the plan.2.It exploded loudly with fire and rock.They

30、were in time to produce the water vapour.in time:sooner or later;eventually;Ill see him in time.in time(for sth./to do sth.):not late She will be back in time to prepare dinner.与与time相关的短语相关的短语:in no time 立刻立刻,马上马上at times 有时有时at a time 每次每次;依次依次once upon a time 从前从前on time 按时按时;准时准时at one time 从前从前

31、for the time being 暂时暂时from time to time 不时地不时地3.as the earth cooled down,water began to appear on its surface.随着地球的冷却随着地球的冷却,地球的表面就开始地球的表面就开始出现了水。出现了水。1)cool down 变凉变凉,冷却冷却2)appear“出现出现,似乎似乎”是不及物动是不及物动词当表示词当表示“似乎似乎,好像好像”时是系动时是系动词词,该词无被动语态。该词无被动语态。Our teacher appeared on TV this morning.I.含义上的差异含义上的

32、差异appear 是指根据事物的外表表象做是指根据事物的外表表象做出判断的出判断的,但实质上并不一定如此但实质上并不一定如此;seem是表示说话人主观上的判断是表示说话人主观上的判断,暗暗含有一定的根据含有一定的根据,往往接近事实的判往往接近事实的判断断;look是根据视觉印象而得出的判是根据视觉印象而得出的判断断,实质上也可能如此。实质上也可能如此。She is fifty but she appears young.她她五十岁了五十岁了,但看起来很年轻。但看起来很年轻。(其实并非其实并非如此如此)Se seems young.(I think he is rich.)她她看起来很年轻。看起

33、来很年轻。(根据个人的主观判断根据个人的主观判断而推断出而推断出)She looks young.她很年轻。她很年轻。(从他外表从他外表可出感觉出可出感觉出)II.用法上的差异用法上的差异a.appear,look,seem 后均可带名词、形容后均可带名词、形容语、语、to be 结构。结构。The man who came yesterday appeared/seemed/looked an honest man.昨天来的那个人看来是一个诚实的人。昨天来的那个人看来是一个诚实的人。b.look 可用于进行时可用于进行时,而而seem,appear 一般不能。一般不能。He is looki

34、ng very happy.他现在看起来很高兴。他现在看起来很高兴。Remember!c.appear 和和seem 之后可接动词不定之后可接动词不定式的一般式、完成式以及其他形式式的一般式、完成式以及其他形式,而而look 之后除了能接之后除了能接to be 结构外结构外,不不接其它动词不定式形式。接其它动词不定式形式。She appeared to agree with you.他他好像同意你的意见。好像同意你的意见。They dont seem to have read this novel.他们好像没有读过这本小说。他们好像没有读过这本小说。d.look,seem 能与介词能与介词li

35、ke 构成习语，构成习语，意思是意思是“看上去象看上去象”,而而appear 却却不能。例如不能。例如:It seems like years since I last saw you.自从上次见到你后自从上次见到你后,好像很久好像很久没有见到你了。没有见到你了。He looks like a student.他看起来象个学生。他看起来象个学生。e.seem,look 后均可接后均可接as if,as though 引导的表语从句引导的表语从句,从句中既可用陈述从句中既可用陈述语气也可用虚拟语气语气也可用虚拟语气,而而appear 则不则不能。能。It seemed/looked as if

36、he had been to Beijing.看起来他去过北京。看起来他去过北京。f.appear 和和seem 均可接均可接that 引导的引导的从句从句,而而look 不能。不能。It seems/appears that we wont finish this work today.我们好像今天完不成这项工作。我们好像今天完不成这项工作。g.appear 和和seem 可用于可用于there be 结结构中构中,而而look 不能。如不能。如:There appears to have been an accident.好像出了一次事故。好像出了一次事故。4.They laid eggs

37、 too.它们也生蛋。它们也生蛋。lay-laid-laid-laying 放放,把把.放在放在.;产卵产卵He laid his books on the desk.注意注意:lay(laid;laid;laying)放置放置;产卵产卵lie(lay;lain;lying)躺躺;位于位于lie(lied;lied;lying)说谎说谎The naughty boy _ to me that the hen that _ there just now had_ two eggs the day before.A.laid;laid;laid B.laid;lay;lainC.lied;laid

38、;lain D.lied;lay;laidD5.They are putting too much carbon dioxide into the atmosphere,which prevents heat from escaping from the earth into space.他们把太多的二氧化碳释放到大气他们把太多的二氧化碳释放到大气层中层中,这就是使得热量不能从地球上这就是使得热量不能从地球上散发到太空中去。散发到太空中去。The rules are intended to prevent accidents.(防止防止)What can we do to prevent th

39、is accident(from)happening?prevent sth./sb.(from)doing sth.制止制止(防止防止)某人某人(某物某物)做某事做某事I intend to go and nothing you do can prevent me!(阻止阻止)Nothing can prevent this plan from being carried out.注意注意:与与prevent sb.from doing sth.类类似结构的有似结构的有keep/stop sb.from doing sth.,但但keep sb.from doing sth.中中from不可

40、省略不可省略prevent/stop sb.from doing sth.中的中的from可省可省,但如在被动语态中但如在被动语态中,他们中的他们中的from都不可省。都不可省。6.the earth may become too hot to lives on.地球可能会因此变得太热而不适地球可能会因此变得太热而不适合生物的生存。合生物的生存。有关有关too的一些用法的一些用法1)too作作“太太”讲。讲。There is too much water.水太多了。水太多了。This shirt is too large for me.这衬衫我穿起来太大。这衬衫我穿起来太大。The probl

41、em is rather too hard for me.这个问题对我来说太难了。这个问题对我来说太难了。2)当当“too adj.(形容词形容词)inf.(动词动词不定式不定式)”时时,有两种不同的意义有两种不同的意义,一种一种为为“太太以至以至(不不)”,在翻译时要在翻译时要加上一个否定词加上一个否定词;另一种是另一种是“太太”,语意肯定语意肯定,但但too后的形容词常用后的形容词常用ready,heavy,beautiful等。等。The question is too hard to understand.问题太难问题太难,理解不了。理解不了。He is too proud to se

42、e his own shortcomings.他太骄傲了以至于看不到自己的缺点。他太骄傲了以至于看不到自己的缺点。You are too ready to find fault with others.你太爱挑别人的毛病了。你太爱挑别人的毛病了。3)当当“only/all/not/buttoo adj.(形容词形容词)inf.(动词不定式动词不定式)”时时,后面的动词不定式在翻译时不后面的动词不定式在翻译时不必加否定词。必加否定词。only等与等与too连用等连用等于于very(非常非常)。I shall be only too pleased to hear from you further

43、.我非常欢迎你再来信。我非常欢迎你再来信。They are but too glad to do so.他们非常喜欢这么做。他们非常喜欢这么做。We are only too pleased to work together with the workers.我们和工人们一起劳动我们和工人们一起劳动,非常高兴。非常高兴。4)在在“cannotcan never.too”结构结构中，应理解为中，应理解为“无论怎样无论怎样也不也不会过分会过分”。You cannot praise him too highly.你无论怎样表扬他也不过分。你无论怎样表扬他也不过分。We cannot be too c

44、areful in doing experiments.我们做实验无论怎样小心也不过分。我们做实验无论怎样小心也不过分。You can never be too careful of your health.你越注意健康越好。你越注意健康越好。5)当当too用于数量增减时用于数量增减时,表示表示“过过(多、多、少、长等少、长等)”的意思。的意思。It is too long by half.它长了一半。它长了一半。He has given me six too many(few).他多他多(少少)给了我六个。给了我六个。This rod is 3 inches too long.这杆长了这杆长

45、了3英寸。英寸。-Are you going to the football game?-No.The tickets are _ expensive for me.A.very much B.far too C.highly D.so much解析解析:too+形容词形容词+for sb.表示表示“太太”,far 可置于可置于too前表示前表示程度。程度。B7.Whether life will continue on the earth for millions of years to come will depend on whether this problem can be solv

46、ed.在未来的千百万年中在未来的千百万年中,生命能否在地生命能否在地球一延续将取决于这个问题能否得球一延续将取决于这个问题能否得到解决。到解决。相关短语：相关短语：believe sb.相信某人（所相信某人（所信任信任/相信相信/依依Tell him what you want to say;hes a man to _.A.count B.believe C.trust D.depend 解析解析:相信相信/信赖某人信赖某人:count on sb./believe in sb./depend on sb./trust(in)sb.C Surf the Internet to find mo

47、re information about Astronomy and you are expected to present it to your peer in the next class.HomeworkSEE YOU9、静夜四无MOMODAPOWERPOINTLorem ipsum dolor sit amet,consectetur adipiscing elit.Fusce id urna blandit,eleifend nulla ac,fringilla purus.Nulla iaculis tempor felis ut cursus.感感 谢谢 您您 的的 下下 载载 观观 看看