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1、Unit 4 Astronomy:the science of the starsTHE 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 _EarthJupiterMarsMercuryNeptunePlutoSaturnUranusVenusPre-reading1.Do you know each reli
2、gion 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.The 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
3、 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 air and sea Day 6:God spoke and created the land animals and man Day 7:God rested and blessed this day calling it Holy ReadingScanning1.What was there on the earth befor
4、e 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.3.Why did animals first appear in the seas?Because water allowed the earth to dissolve harmful gases into the oceans an
5、d 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 other animals?They were different because they produced their young from within their bodies.Read the passage quickly and
6、 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 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(pa
7、ra2.3.4)Water made it possible for life begin to develop.The development of living things.Para.1 Para.2Para.3Para.4Para.5A_ about how the universe was formedThe_ of the earthThe importance of_ for lifeThe_ of plants and animalsThe arrival of _ and their effects on the earththeoryformationwaterdevelo
8、pmenthumansHow life began on the earthBefore life appeared.Different lives developed.Part1(para13)Before life appeared According to a widely accepted theory,how did the stars form?How did the earths atmosphere form?Why was the earth different from the other planets?What a role the water played in th
9、e development of life?1.According to a widely accepted theory,how did the stars form?2.How did the earths atmosphere form?The universe began with a“Big Bang”that threw matter in all directions,then atoms began to form and combine to create stars.The earth was so violent.It exploded loudly with fore
10、and rock to produce carbon,nitrogen,water vapor and other gases,which were to make the atmosphere.3.Why was the earth different from the other planets?4.What a role the water played in the development of life?Because the water on other planets had disappeared later.The presence of water allowed the
11、earth to dissolve harmful gases and acids into the oceans and seas.This produce a chain reaction which made it possible for life to developThe earth was just a cloud of dust whose future is _ after the“Big Bang”.Then the dust began to settle into a _ ball which is so _ and _ loudly with fire and roc
12、k,to be in time to produce many things,which make the earths _.As the earth cooled down,_ began to appear and people think it is important for the beginning of life.It allowed the earth to dissolve _ gases.Then life began to develop.uncertainsolidviolentexplodedatmospherewater harmful I felt lonely
13、and life was dull at that time.Part2(para45)How the life developed 1.Make a timeline of the development of life 2.Why did the plants grow before the animals came?3.Why is it wrong in films and stories to show dinosaurs and people together?1.2.3.4.5.6.small plants On surface of waterEarly shellfish a
14、nd all sorts of fishgreen plants on land land animals insects(on land)amphibian(on land and in water)Mammals-clever animalsforests reptiles(huge animal-dinosaurs)3.Why is it wrong in films and stories to show dinosaurs and people together?2.Why did the plants grow before the animals came?Because pla
15、nts provide oxygen for animals to breathe.Because dinosaurs died out long before human beings developed on the earth.Nobody understood plants were the start of changes.They _ and filled the first oceans and seas with oxygen.This encouraged the _ of early shellfish and fish.Land animals such as insec
16、ts,amphibians,reptiles and dinosaurs and so on _ after the first green plants appeared.Dinosaurs disappeared,which made possible the rise of _ on the earth.Then small clever animals _ all over the earth.multiplieddevelopmentspreadWith so many friends on me,I was happy.followedmammals Humans develope
17、d new _ of growing,hunting and moving around.As time went by they covered the earth.Now _ carbon dioxide has been putting into the _,which _ heat_ escaping from the earth into space.As a result,the problem of _ occurs.Whether life will continue on the earth for millions of years to come will _ wheth
18、er this problem can be solved.meansfrompreventsNow,I m worried about the future of myself and humansdepend ontoo muchatmosphereglobal warmingBig BangA cloud of dust Atmosphere The earthA solid ballwaterwaterPlants in the waterShellfish and fishPlants on landInsects and amphibiansReptiles Dinosaurs M
19、ammals humans came into being and spread all over the world.According to the pictures,have a try to retell the development of life.Suppose you were the earth,what would you advise humans to do?Write a letter to the human being.Para1 1 a widely accepted theory2 begin with3 in all directions Para2 1.W
20、hat it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe.2.The earth became so violent that it was not clear whether the shape would last or not.3.What is even more important is that as the earth cooled down,water began to appear on its
21、surface.Para3 1.It was not immediately obvious that water was to be fundamental to the development of life.2.What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acid into the oceans and seas.3.3 make it possible for life to developPara
22、41 on the surface of the water2 fill the oceans and seas with oxygen3 live on land as well as in the water4 produce young by laying eggs5 the age of the dinosaurs6 remain a mystery7.This disappearance made possible the rise of mammals on the earth.Para51 spread 2.They are putting too much carbon dioxide into the atmosphere,which prevents heat from escaping from the earth into space.3.As a result of this,many scientists believe the earth may become too hot to live on.4.Whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.