1、Unit 4 AstronomyTwinkle Twinkle Little StarTwinkle twinkle little starHow I wonder what you areUp above the world so highLike a diamond in the skyTwinkle twinkle little starHow I wonder what you areWhen the blazing sun is goneWhen he nothing shines uponThen you show your little lightTwinkle twinkle
2、all the nightTwinkle twinkle little starHow I wonder what you areWarming-up 2.What words will you think of when we talk about astronomy?starsmoonsunplanetthe solar systemthe Milky Way Galaxy(星系星系)earth 1.Whats the meaning of the word“Astronomy”?the science of starssunearththe solar systemthe Milky W
3、ay GalaxyGalaxy 1Galaxy 2Galaxy the Universethe origin of the universe in different religions and culturesseparated the sky from the earth.made humans.Pan GuNvwa_ created the world in 7 days.GodIn this unit,well learn something more scientific.Pre-readingHow life began on the earth?ReadingThe text i
4、s mainly about A.the solar systemB.the earths problemsC.the difference between the earth and other planetsD.the development of earth and life on the earthReadingPart 1:The development of the earthPart 2:The development of life(para 13)(para 45)(2)What happened to the earth after the“Big Bang?Read pa
5、ra.1-3(3)What appeared as the earth cooled down?(1)How did the universe come into being?(1)How did the universe form?-According to a widely accepted theory,the universe began with a“”It threw in all directions.After that began to form and combine to create stars and other bodies.matterBig Bangatoms(
6、2)What happened after the“Big Bang?A.The earth was just a cloud of dustB.The earth become a solid ball quickly.C.The earth atmosphere appeared.D.Water stayed on the moon.Read para.1-3Between 4.5 and 3.8 billion years ago,the dust settled into .a solid globewas a cloud of dustwas a cloud of dustsettl
7、ed into a settled into a solidsolid ball ballexploded with fire&rockexploded with fire&rockproduced COproduced CO2,2,NN2,2,HH2 2O andO and other gases)other gases)atmosphereatmospherewater appearedwater appeared (3)What appeared as the earth cooled down?Water is fundamental to the beginning of life
8、on earth.Because water allowed the earth to dissolve harmful gases and acids into oceans and seas.chain reaction bagan to develop.Life1 Insects and amphibians appeared.2 Reptiles appeared.3 Shellfish and other fish appeared.4 Clever animals with hands and feet appeared.5 Dinosaurs appeared.6 Small p
9、lants grew on the surface of water.7 Green plants began to grow on dry land.8 Water appeared on the earth.9 Mammals appeared.The author uses some words to organize them,e.g.“Next”.Can you find some more in Para 4&5?Put the order of development of life into a timeline.Paragraph 4&556 39724181.Who are
10、 the small clever animals with hands and feet?2.Are they taking care of the earth well?Why?Humans are putting too much carbon dioxide into the atmosphere,which prevents heat from escaping from the earth into space.The earth may become too hot to live on.Discussion What can we do to prevent the earth
11、 from becoming hotter and hotter?clean energy plant trees recycle rubbish use public transportWhether life will continue on the earth depends on human beings.1.The earth appeared before the Big Bang happened.2.The original atmosphere consisted of nitrogen and oxygen.3.The main difference between the
12、 earth and other planets is that there is water on the earth.4.Life began in water and then on land.FFTT True(T)or False(F)5.Mammals appeared before the development of dinosaurs.6.Dinosaurs could give birth to young baby animals and produced milk to feed them.7.Human beings produce too much carbon d
13、ioxide which causes the global warming on the earth.8.According to the text,human beings would disappear in the end.FFTF True(T)or False(F)True(T)or False(F)Homework1.Write a passage about what we can do to prevent the global warming.2.Find out the difficult sentences that you want to learn about.The EndThankyou
