1、Unit 4 ,Astronomy: the science of the stars,话题语篇导读,Will the continents join again in the far future?In the beginning，more than 4.6 billion years ago，the world was a ball of burning gas，going round and round through space.At first，hot gases were able to escape into outer space，but as the Earth cooled
2、，they were held by gravity to form the early atmosphere.Clouds began to develop as water vapour collected in the air.And then it began to pour with rain，causing the early oceans to rise up.,It took hundreds of millions of years for the first land masses to appear.About 250 million years ago，long，lon
3、g after the Earth had formed，all the continents of the time had joined together to form a supercontinent called Pangaea.This supercontinent broke up about 200 million years ago to form two giant continents，Gondwana and Laurasia.Gondwana was made up of what is now Africa，South America，Australia，Antar
4、ctica and India.The Indian subcontinent lay off the east coast of Africa，before it broke off and moved north rapidly.,It collided with Asia，creating one of the worlds greatest mountain ranges，which extends for more than 2,400 kilometersthe Himalayas.By now，our world had started to look like somethin
5、g we would recognize.The amazing process of plate tectonics(板块构造)，in which the Earths land masses move slowly across the Earths crust(外壳)，is still continuing.Far in the future，some scientists have predicted that the present continents will join again，to form a new supercontinent.Only time will tell.
6、,Notes 1.Pangaea n.海洋泛大陆；盘古大陆2.giant adj.巨大的3.collide vi.碰撞，相撞,Task 判断正(T)误(F)1.The early oceans appeared because of the rain which developed from hot gases.( )2.Pangaea was made up of what is now Africa，South America，Australia，Antarctica and India.( )3.Only time will tell whether the present contin
7、ents will join again.( ),答案,F,T,T,Period OneWarming Up，Pre-reading & Reading,课前预习 基础落实,课堂讲义 核心突破,当堂达标 检测巩固,.单词检测1. n.天文学2. n.系统；体系；制度3. n.宗教；宗教信仰4. n.学说；理论5. adj.猛烈的；激烈的；强暴的6. n.大气层；气氛7. prep.与不同；不像,答案,词语识记,课前预习 基础落实,astronomy,system,religion,theory,violent,atmosphere,unlike,答案,8. adj.基本的；基础的9. adj.
8、有害的10. n.链子；连锁；锁链11. vi.&vt.乘；增加12. vi.生存；存在13. adv.因此；于是14. n.迷；难题 vt.&vi.(使)迷惑；(使)为难,fundamental,harmful,chain,multiply,exist,thus,puzzle,答案,.短语检测1.solar 太阳系2. time及时；终于3.all of各种各样的4. eggs下蛋5.give to产生；分娩6. ones turn轮到某人7.prevent. 阻止；制止,system,in,sorts,lay,birth,in,from,.阅读课文，匹配各段落大意Para.1( ) A.T
9、he formation(形成) of the earth.Para.2( ) B.The importance of water for life.Para.3( ) C.A widely accepted theory about the formation of the universe.Para.4( ) D.The arrival of humans and their impact on the earth.Para.5( ) E.The development of plants and animals on the earth.,答案,课文预读,C,A,B,E,D,.阅读课文，
10、判断正(T)误(F)1.It was not until between 4.5 and 3.8 billion years ago that people knew what the earth was to become.( )2.Water began to appear on the surface of the earth before gases were produced.( )3.The global warming will have a great effect on human beings.( ),答案,T,F,T,答案,.课文阅读理解1.What began to a
11、ppear on the earths surface when it cooled down?A.Water. B.Gases. C.Acids.答案A,1,2,3,4,5,答案,2.From the last paragraph we can infer that the author is .A.confident B.sad C.concerned,1,2,3,4,C,5,答案,1,2,3,4,3.What does the word “they” in the sentences “It exploded loudly with fire and rock.They were in
12、time to produce carbon dioxide，nitrogen，water vapour and.” refer to?A.Planets.B.Fire and rock.C.Gases.答案B,5,答案,4.Which is the right order of the development of life?A.Small clever animalsshellfishdinosaursmammals.B.Shellfishdinosaurssmall clever animalsmammals.C.Shellfishdinosaursmammalssmall clever
13、 animals.答案C,1,2,3,4,5,答案,5.Why were mammals different from other life forms?A.Because they gave birth to young baby animals and produced milk to feed them.B.Because they produced young generally by laying eggs.C.Because they were able to live on land as well as in the water.答案A,1,2,3,4,5,答案,.阅读课文，完
14、成框架图,atoms,dust,globe,carbon,atmosphere,答案,plants,oxygen,land,forests,Human beings,.难句分析1.What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe.句式分析：这是一个复合句。what引导 从句，在从句中作 。what引导的名词性从句除了作主语外，还可以作等。自主翻译：,主语,宾语,宾语、表语,随后它会变成什么没人能知道，直到
15、4538亿年前，这团尘埃才慢慢地形成一个固体的球状物。,答案,2.The earth became so violent that it was not clear whether the shape would last or not.句式分析：这是一个复合句。此处为连词so.that.引导的 从句，其中从句中的it为 ，连词whether引导的从句为真正的主语。自主翻译：,答案,结果状语,形式主语,地球开始变得如此激烈动荡以至于不知道这个固体形状是否会继续存在下去。,答案,3.So whether life will continue on the earth for millions o
16、f years to come will depend on whether this problem can be solved.句式分析：这是一个复合句。第一个whether引导 从句；第二个whether引导 从句。自主翻译：,返回,主语,宾语,所以，在未来的数百万年中，生命能否在地球上延续取决于这个问题能否得到解决。,violent,语境感悟,课堂讲义 核心突破,重点单词,(1)(教材P25)The earth became so violent that it was not clear whether the shape would last or not.地球开始变得如此激烈动荡
17、以至于不知道这个固体形状是否会继续存在下去。(2)When the man got drunk，he became very violent.当喝醉酒时，这人变得很粗暴。(3)Whatever happens，we will never use violence.无论发生什么，我们决不会使用暴力。,归纳拓展,(1)violent adj.猛烈的；激烈的；强暴的(2)violently adv.猛烈地；凶猛地(3)violence n.暴力；暴行；激情with violence猛烈地；强有力地take.by violence强夺,(1)用violent的正确形式填空Larry was in pa
18、in.As a result，he behaved and treated everything with .(2)完成句子为什么一些火山比另外一些火山喷发得更猛烈？Why are some volcanic eruptions others? 他昨天赶上了暴风雨。He was caught in yesterday.,答案,即时跟踪,violent,violently,violence,more violent than,a violent storm,unlike,语境感悟,(1)(教材P26)Water had also appeared on other planets like Ma
19、rs but，unlike the earth，it had disappeared later.在火星等其他行星上也出现了水，但不像在地球上一样，这些水后来消失了。(2)Its very unlike him to be so late.迟到这么久可实在不像他平时的作风。(3)He is likely to arrive a bit late.他可能会晚到一会儿。,归纳拓展,(1)unlike prep.与不同；不像；adj.不同的；相异的Its unlike sb.to do sth.做不像某人平常的样子(2)unlikely adj.不大可能发生的；未必会发生的(3)likely adj
20、.可能的be likely to do sth.可能做某事Its likely that.有可能,图解助记,(1)选词填空,即时跟踪,They are so that nobody believes they are twins.Since their parents strongly disagree，they are to marry.He is more his mother than his father.It is to rain.,答案,unlike,unlikely,like,likely,(2)完成句子有可能他不参加会议。 he will not attend the meet
21、ing.今年秋天约翰可能在伦敦。John be in London this autumn.,答案,Its likely that,is likely to,harmful,语境感悟,(1)(教材P26)What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acids into the oceans and seas.很多科学家相信，由于地球上长期有水存在，使地球得以把有害气体和酸性物质溶解在海洋里。(2)This
22、object gives off harmful gases which are harmful to our health.此物散发出损害我们健康的气体。(3)There is no harm in writing down your name on the form.在表格里写下你的名字不会有什么坏处。,归纳拓展,(1)harmful adj.有害的be harmful to.对有害(2)harmless adj.无害的(3)harm n.损害；伤害；vt.对有害；伤害；损害do sb.harm(good)/do harm(good) to sb.对某人有害(好)处There is no
23、harm in doing sth.做某事无害处,即时跟踪,(1)同义句转换Watching TV too much does harm to your eyes.Watching TV too much your eyes.Asking your teachers for advice more often does no harm to you. asking your teachers for advice more often.(2)完成句子这种药对儿童有害，却对成年人没有什么害处。The medicine children but does no harm to adults.,答案
24、,is,harmful,to,There,is,no,harm,in,is harmful to/does harm to,exist,语境感悟,(1)(教材P26)They laid eggs too and existed on the earth for more than 140 million years.它们也生蛋，在地球上存在了1亿4千多万年。(2)There exists a tall tree in front of my home.在我家门前有一棵很高的树。(3)Do you know when this kind of robot came into existence?
25、你知道这种机器人是什么时候问世的吗？,归纳拓展,(1)exist vi.存在；生存exist in.存在于中exist on.靠生活/生存There exists.存在；有(2)existence n.存在；生活in existence现存的；现有的come into existence产生；成立；开始存在,注意：exist没有被动语态和进行时。,答案,单句语法填空(1)He doesnt believe in the (exist) of ghosts(鬼).(2)Dinosaurs (exist) on the earth a long time ago.(3)Similar proble
26、ms exist other countries as well.(4)It was impossible for them to exist such a small income.,即时跟踪,existence,existed,in,on,puzzle,语境感悟,(1)(教材P27)How life began on earth is one of the biggest puzzles that scientists found hard to solve.地球上生命的起源是科学家们难以解决的最大难题之一。(2)Im in a puzzle as to how to get along
27、with him.对于如何和他相处我感到困惑。(3)What puzzled me was why they had such a violent quarrel.令我不解的是他们为什么发生了如此激烈的争吵。,归纳拓展,(1)puzzle n.谜；难题；vt.& vi.(使)迷惑；(使)为难be in a puzzle感到困惑；不知如何是好puzzle about/over冥思苦想；苦苦思索(2)puzzling adj.令人迷惑的(3)puzzled adj.感到迷惑的be puzzled about对迷惑不解,图解助记,答案,(1)用puzzle的正确形式填空The girl looked
28、 at her mother with a expression，which suggested that the problem was quite . (2)完成句子这个学生为下一步做什么而伤透了脑筋。The student what to do next.事实上，困扰你的事情对于很多中国的父母来说也是一个难题。What you is actually to many parents in China.,即时跟踪,puzzled,puzzling,was puzzled about,puzzles,a puzzle,答案,(3)单句改错The puzzling look on her fa
29、ce suggested she was uncertain about the math problem.,puzzled,in time,重点短语,语境感悟,(1)(教材P25)They were in time to produce carbon dioxide，nitrogen，water vapour and other gases，which were to make the earths atmosphere.它们最终产生了二氧化碳、氮气、水蒸气和其他气体，从而形成了地球的大气层。,(2)Fortunately，the firefighters arrived in time t
30、o save the child trapped in the building.幸运的是，消防员及时赶到救下被困在大楼里的孩子。(3)At no time in his life has he been braver than in that case.他一生中从来没有像那一回那么勇敢。,归纳拓展,in time及时；终于；迟早；总有一天on time准时；按时at a time一次；每次at one time曾经；一度at times有时；偶尔in no time马上；立刻at no time绝不(置于句首时，句子常用倒装),(1)选词填空,答案,即时跟踪,I feel him a lit
31、tle stubborn .Fortunately，a soldier came to rescue to save the drowning boy.Hurry up！The concert will begin . will I give in to the difficulty.,at times,in time,in no time,At no time,答案,(2)单句改错I must hurry，because I want to get home on time to see the football match on TV.You can only borrow two boo
32、ks from the library at one time.,in,a,语境感悟,(1)(教材P26)These animals were different from all life forms in the past，because they gave birth to young baby animals and produced milk to feed them.这些动物不同于以往所有的生命形态，因为它们能生产幼仔并给幼仔哺乳。(2)The scientists experiments gave birth to a new drug.那位科学家的实验产生了一种新药。(3)Sh
33、e is English by birth but French by marriage.她是英国血统，但嫁给了法国人。,give birth to,归纳拓展,give birth to产生；分娩by birth出生；血统；天生地at birth一出生；出生时,答案,即时跟踪,(1)完成句子无休止的选择让人们在生活中产生了焦虑。The endless choices anxiety in peoples lives.据说杰克逊生来就是黑人。Jackson was said to be a black man .(2)单句改错The baby weighed seven pounds by bi
34、rth.,give birth to,by birth,at,in ones turn,语境感悟,(1)(教材P26)Thus they have，in their turn，become the most important animals on the planet.于是，它们接着成了这个行星上最重要的动物。(2)It will be in Toms turn to be on duty tomorrow.明天轮到汤姆值日。(3)All theories are from practice and in turn serve practice.所有的理论都来源于实践，并反过来为实践服务。,
35、归纳拓展,in ones turn轮到某人；接着in turn依次；轮流；相应地；转而；反过来by turns轮流；交替take turns to do/in doing sth.轮流做某事Its ones turn to do sth.轮到某人做某事,(1)用适当的介词填空They should take turns looking after their old mother.We do some cleaning turns.(2)完成句子更为重要的是，我觉得该是我开始照顾父亲的时候了。More importantly，I found to start looking after my
36、father.他们接着为这项计划提了一些建议。They， ,gave some advice for the plan.,答案,即时跟踪,in,by,it was my turn,in their turn,prevent.from.,语境感悟,(1)(教材P26)They are putting too much carbon dioxide into the atmosphere，which prevents heat from escaping from the earth into space.他们把过多的二氧化碳释放到大气层中，这就使得地球上的热量不能释放到太空中去。(2)Gener
37、ally，parents dont permit their kids to do dangerous things，so they always prevent the kids from taking chances.一般来说，父母不允许孩子做危险的事情，因此他们总是阻止孩子们去冒险。,归纳拓展,keep sb.doing.使某人一直做protect.from/against.保护不受侵袭(from/against后接能带来伤害或损害之物),注意：在被动语态中，表示“阻止某人做某事”的三个短语都不能省略from。,(1)用所给动词的正确形式填空Soldiers have been sent
38、 to prevent the fire (spread) to the next building.I dont want to be here any longer；they have kept us (wait) for them for a long time.(2)完成句子他们被阻止进入燃烧着的大楼。They were the burning building.,答案,即时跟踪,(from) spreading,waiting,stopped/prevented/kept from entering,纸板箱不利于防止货物受损。Cardboard cases are not good
39、at 害怕(失败)使他不敢尝试。Fear trying.(2015天津)(3)单句改错The plan can be prevented being carried out.,答案,protecting the goods from/against damage.,prevented him from,from,由whether引导的名词性从句语境感悟(1)(教材P26)So whether life will continue on the earth for millions of years to come will depend on whether this problem can
40、be solved.所以，在未来的数百万年中，生命能否在地球上延续取决于这个问题能否得到解决。(2)Whether you can succeed or not depends on how hard you work at it.你能否成功取决于你努力的程度。(3)It is uncertain if he will leave for Beijing tomorrow.明天他是否去北京还不确定。,经典句式,归纳拓展,教材原句是复合句，句中两个whether分别引导了两个名词性从句，前者为主语从句，后者为宾语从句。使用whether而不用if的情况：主从表从同位从，if不用whether用；
41、discuss和介词后，whether用来引宾从；不定式，or not后面跟，whether独能显神通；宾从如是否定句，if发挥其功能。,(1)完成句子我不会问你问题来检查你是否读懂了这些书。I am not going to ask you questions to find out .(2015浙江)我们下周是否进行检测考试尚未确定。 next week remains to be seen.,即时跟踪,答案,whether you understand,the books or not,Whether well have a quiz,(2)单句改错I havent decided if
42、 to buy the car.Whether he attends the meeting，Ill tell you about it on the phone.,答案,whether,If,返回,.单句语法填空1.(multiply) very fast，rabbits soon became the largest family of all the animals in this woods.2.I was (puzzle) about how to handle the situation.3.The thief attached me (violent) and I was kno
43、cked down before I could ask for help.4.After Yang Liwei succeeded in circling the earth， our astronauts desire to do is walking in space.5.Do they exist vegetable food?,答案,当堂达标 检测巩固,Multiplying,puzzled,violently,what,on,.选词填空,答案,give birth to，according to，prevent.from.，as a result，in time,1. a UN r
44、eport，the globe is becoming warmer and warmer.2.The animal young baby animal in the ocean.3.There was a traffic jam； ，I was late for school.4.He braked(刹) his car just to avoid an accident.5.I was attending the meeting by a cold.,According to,gives birth to,as a result,in time,prevented from,.同义句转换1
45、.He is so warmhearted a person as we all admire.He is warmhearted a person we all admire him.2.Whether well pay a visit to the temple depends on the weather. the weather well pay a visit to the temple.3.My father usually walks in the park after supper.This is his habit.My father in the park after supper.,
