人教版高中英语必修三 Unit 4 Astronomy：the science of the stars reading课件(共27张PPT)

课件27张PPT。 Unit 4 Astronomy：the science of the stars Do you know the correct order of their distance to the sun? nearest to
the sun? farthest to
the sun?The names of eight planets.Mercury
Venus
Earth
Mars
Jupiter
Saturn
Uranus
Neptune1) 水星
2) 金星
3) 地球
4) 火星
5) 木星
6) 土星
7) 天王星
8) 海王星PlutoScientists now think Pluto is
too small to be called a planet.In this unit, we’ll learn something more scientific.
1.What’s the title of the text?2. From the title, we can predict that the text may tell us the origin of life on the earth.
Do you know some stories about it?How life began on the earth In China:____________ separates(分) the sky
　　　　　　　　　 from the earth.Pangu 盘古skyearth_____________ made human beings.Nuwa (女娲)In western countries:
　　　　　　　God created the world in seven days.Para.1

Para.2
Para.3
Para.4
Para.5 A theory about how the universe was formedThe formation(形成） of the earthThe importance of water for lifeThe development of plants and animalsThe arrival of humans and their effects on
the earthPart1: The development of the earthPart2:The development of life.Fast reading Read the passage on P25 quickly, and match the right main idea of each paragraph. How many parts can the text be divided into?Part 1(1~3): The development of the earthPart1 (para1~3) The development of the earth
1. After the Big Bang, what happened?
2. What happened to the solid globe next?
3. What did the water vapour and gases form?
4. What appeared after the earth cooled down?
5. What did the water do?1. After the Big Bang, what happened? a cloud of dust a solid ball Settled intoexploded with fire and rock produced water
vapour and gases2. What happened to the solid globe next?In time3. What did the water vapour and gases form?the earth’s atmosphereWater appeared on its surface which is important for the beginning of life on the earth. 4.What appeared after the earth cooled down?5.What did the water do?It allowed the earth to dissolve harmful gases and acids into the oceans and seas.a cloud of _____ Big Banga solid _______slowly combinethe earth ______ downit exploded loudly with _____ and _____waterthe earth’s ___________dustball/globefire rockatmospherecooledHow did the earth come into being(产生）?Part 2 (4~5) The development of life
1.What life developed after water appeared?
2. What life developed after forests
appeared?
3. What life developed after dinosaurs?
4. What life developed after mammals?
Part 2 (para4~5) The development of lifearrival of small plants in water1.What life developed after water appeared?early shellfish and all sorts of fishPart 2 (para4~5) The development of life reptiles on land dinosaurs on land2. What life developed after forests appeared? How do reptiles produce young? by laying eggsmammals on land3. What life developed after dinosaurs? How do mammals produce young? by giving birth to baby animals and producing milk to feed them. small clever animals4. What life developed after mammals? 1.Who are the small clever animals with hands and feet?
2. Are they taking care of the earth well? Why?
? Because they 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 . How to solve this problem?To solve this problem, people should protect the earth carefully.
They must stop putting too much carbon dioxide into the air , reduce pollution, control the population and so on .A 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 appear → retiles appear → dinosaurs appear → mammals appearThe development of lifeinsects and amphibians appearreptiles appeardinosaurs appearmammals appear