1、Unit 4Astronomy:the science of the starsThe Solar system eight planets many comets other objectsWhat are the names of the eight planets that circle our sun?土星Saturnst(:)n天王星Uranusju:rns金星Venusvi:ns地球Earth火星Mars水星Mercurym:kjuri木星Jupiter du:pit海王星Neptuneneptju:nEach religion and culture has its own id
2、eas about how life began on earth.What do you know?Nuwa createdHuman BeingsPangu Separated Sky from Earth Pangu separated the earth and sky with an ax.After he died,his breath became wind and cloud;his voice became thunder and his left eye sun and right one moon;arms and legs became edges and mounta
3、ins;bloodbecame rivers and tendon(筋脉)became roads;muscles became fields and hair became forests;teeth and bones became metals,pearls and jade(玉石);sweatbecame rain.Other legends about the beginning of universeThe Biblical AccountDay 1:God spoke and separated light from darkness creating Day andNight.
4、Day 2:God spoke and separated the water creating sky and ocean.Day 3:God spoke and created dry land.上帝创世说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 blesse
5、d this day calling it Holy.EarthHow life began on the earthUseful expressions:according to a widely accepted theorybegin with in all directiona cloud of dustsettle into a solid globein timecool downencourage the later development oflive on land as well as in the waterfor the first timelay eggsthe ag
6、e ofgive birth toIt was not immediately obvious that What many scientists believe is that Why they suddenly disappeared still remains a mystery.in ones turnprevent from doing sth.escape from as a result of1.Who knows how life began on the earth exactly?A.Scientists.B.Astronomers.C.No one.D.Aliens(外星
7、人).2.What does“small clever animals”refer to?A.Insects.B.Reptiles.C.Dinosaurs.D.Humans.3.How many stages are there during the evolution of life on the earth?A.three B.four C.five D.six Fast ReadingThe Big BangDetailed ReadingThe development of the earthStage 1:The development of the earth(1)After th
8、e Big Bang,what happened?a cloud of dusta violent solid globe exploded with fire and rockproduced water vapour and gases(2)What happened next?(3)What did the water vapour and gases form?the earths atmosphereWater appeared which was to be fundamental to the development of life.(4)What appeared on the
9、 earth then?(5)What did the water form?oceans and seas1.Big Bang(several billion years ago)2.a cloud of dust3.a solid globe4.exploded with fire and rock5.produce carbon,nitrogen,water vapour and other gasesHow did the earth come into being?7.The earth cooled down8.waterappeared9.harmful gases and ac
10、ids were dissolved6.make the earths atmosphere10.oceans and seas The development of lifeextremely small plants in water(1)What life developed after water appeared?Stage 2:The development of lifeearly shellfish and all sorts of fishgreen plants on land(2)What life developed after the life in water?(3
11、)What life developed next?land animals insectsamphibiansreptiles on landdinosaurs on land(4)What life developed after forests appeared?mammals on land(5)What life developed after dinosaurs?small clever animals with hands and feet(6)What life developed after mammals?watergreen plants on land234How li
12、fe began on the earth5678forestsshellfish and all sorts of fishinsects(on land)amphibians(on land and in water)reptiles(on land)dinosaurs(on land)mammals(on land)small clever animals with hands and feet humansmall plants in water1In some films and stories,we can see dinosaurs and people together.Is
13、it right?Why?Because dinosaurs died out long before human beings developed on the earth.Discussion 1.Are humans the cleverest animals?Why?2.Are they taking care of the earth well?Why?Discussion 1.Because they developed new methods of growing food,hunting and moving around.2.Because they are putting
14、too much carbon dioxide into the atmosphere,which prevents heat from escaping from the earth into space.The earth may become too hot for the lives on it.greenhouse effectglobal warmingParagraph 1:A widely accepted theory about the formation of the universeParagraph 2:The formation of the earthParagr
15、aph 3:The importance of water for lifeParagraph 4:The development of plants and animals on the earthParagraph 5:The arrival of humans and their impact on the earthA cloud of dust a solid ball presence of water on the water shellfish&other fish plants begin to grow on dry land insects and amphibians
16、appear retiles appear dinosaurs appear mammals appearThe development of lifesmall plants growon the waterappearshellfish&other fishplants begin to grow on drylandinsects and amphibians appearreptiles appeardinosaurs appearmammals appearBig BangA solid ballAtmosphere The earthWater orAirLifeWater is
17、the headspring of life.?How Life Began on the Earth?It was full of water.Original cells.The cells in the water began to separate.waterPlants in the waterShellfish and fishPlants on landInsects and amphibiansReptiles Dinosaurs Mammals Man had evolved(进化)from apes(猿).True(T)or False(F).1.The earth app
18、eared before the Big Bang happened.2.The original atmosphere consisted of nitrogen and oxygen.3.Water also appeared on other planets like Mars,but it disappeared later.4.Life began in water and then on land.5.Mammals appeared before the development of dinosaurs.FFTTFScanning1.What was produced when
19、the earth exploded?2.How did water come into being on the earth?3.Where did life first begin,on the land or in the sea?4.Why were mammals different from other animals?1.What was produced when the earth exploded?Water vapour,carbon dioxide,oxygen,nitrogen and other gases.2.How did water come into bei
20、ng on the earth?The explosion of the earth produced water vapor,which turned into water when the earth cooled down.3.Where did life first begin,on the land or in the sea?In the sea.Because water dissolved harmful gases and made it possible for life to begin.4.Why were mammals different from other an
21、imals?Because they produced they gave birth to young baby animals and produced milk to feed them.Careful ReadingThink about what you have read and make choices.Why was the earth different from other planets?A it produced a lot of heat.B.The water remained.C Water disappeared.D.It was the oldest plan
22、et.Why was life able to develop on the earth but not on other planets?A The earth had a solid shape.B.The earth did not have harmful gases in its atmosphere.C The water stayed on the earth but not on other planets.D.The earth was not too hot and not too cold.Why was it necessary for plants to grow b
23、efore animals?A Animals needed plants to protect them from the sun.B Plants provided oxygen for animals to breathe.C Animals could hide from hunters in forest.D It was easier for plants to grow.What problem is caused by human being?A They exist everywhere on the earth.B They cause global warming.C T
24、hey find new methods of growing crops.D They enjoy hunting and fishing.RetellText Retelling The universe began with a _that threw_in all directions.between_and_ billion years ago,the cloud of dust settled into a _.after it exploded loudly with fire and rock,they were in time to produce carbon,nitrog
25、en,_,which turned into water when the earth cooled down.Water allowed the earth to _harmful gases into the oceans and seas.That made it possible for _ to begin to develop.dissolvelifeBig Bangmatter4.53.8solid globewater vapourThe arrival of small _ encouraged the development of early _ and all sorts
26、 of fish.Many millions of years later the first green plants began to appear on land.Later land animals appeared.Some were_ Others,called_,were able to live on land as well as in the sea.When the plants grew into forests,_appeared for the first time.Then _developed,which became the most important an
27、imals on the earth for millions of years.insectsamphibiansreptilesdinosaursText RetellingplantsshellfishAfter they disappeared,_ became more important.They were the last group of animals and they were different because they _ their young and _milk to feed them.about _million years ago,Small clever a
28、nimals,with hands and feet,_ and _ all over the earth.As time went by,they covered the earth and have become the most important animals on the planet.appearedspreadText Retellingmammalsgave birth toproduced2.6Thank you very much.Good bye!India Brahma(婆罗门)is the god first representedin(代表)the Hindu Triad(三合会).He is the creator of the universe and all living beings are said to have evolved from(从形成)him.
