人教版必修3：Unit+4+Astronomy_+the+science+of+the+stars+warming+up+and+reading（共33张PPT）2.ppt

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1、 Unit 4 Astronomy:The science of the starsWarming up,Pre-reading,Reading1.Whats the meaning of the word “Astronomy”?I. Warming upthe science of stars;the scientific study of stars and planets.2. What words will you think of when we talk about this topic? star, planet, the sun / moon / earth, solar s

2、ystem 恒星恒星 行星行星 太阳太阳 月球月球 地球地球 太阳系太阳系 3. How many planets are in the solar system? 4. Do you know the correct order of their distance to the sun? nearest to the sun? farthest to the sun?5. The names of eight planets.(remember them) Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune1) 水星水星2) 金星金星

3、3) 地球地球4) 火星火星5) 木星木星6) 土星土星7) 天王星天王星8) 海王星海王星Mercury Venus Earth Mars Jupiter Uranus Saturn Neptune6. Put them in correct order on P25.Do you know their origin?II. Pre-reading1.Have you ever asked your mother, “Mom, where do I come from”?2. The origin of life on earth is a question that interests a

4、stronomers. What do you know about it?3. Each religious and culture has its own ideas about how life began on earth. What do you know?III. Fast-reading1. In this unit, well learn something more scientific.2. Whats the title of the text?3. From the title, we can predict that the text may tell us the

5、origin of life on the earth.4. Match the main idea for each paragraph.Para.1 Para2.Para3.Para4.para5The importance of water for life.A theory about how the universe was formed.The formation of the earthThe arrival of humans and their effects on the earth. The decelopment of plants and animals. Detai

6、led reading This text can mainly divided into two stagesStage 1 : The development of the earthStage 2 : The development of life(para 13)(para 45)Stage 1: The development of the earth(1) After the Big Bang, what was the earth like? a cloud of dust a solid globe exploded with fire and rock produced wa

7、ter vapour and gases(2) What happened next?(3) What did the water vapour and gases form?the earths atmosphere Water appeared(4) What appeared as the earth cooled down?water is important for the beginning of life on the earth. Why is water so important for the beginning of life? Because water allowed

8、 the earth to dissolve harmful gases into oceans and seas.Stage2 The development of lifeStage2 The development of life small plants appears in water 1.What life developed after water appeared?Shellfish and all sorts of fish 2.What life developed in water next? green plants began to grow on land inse

9、cts appeared3.What about the life on land?amphibians on land and in the waterforests4. What life developed next on land? reptiles appeared dinosaur developed 5.What life developed after forests appeared?mammals on land6.What life developed after dinosaurs? small clever animals7. What life developed

10、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 .Can you fi

11、ll in the blanks?23456789101 small plants in water small plants in watershellfish and all sorts of fish insectsinsects reptiles reptilesamphibiansmammalsdinosaurs humansplantsanimalsGreen plants on landforests1. Insects and amphibians appeared. 3. The earth became a solid ball.5. Reptiles appeared.

12、7. The earth was a cloud of dust9. Shellfish and other fish appeared.11. Clever animals with hands and feet appeared2. Dinosaurs appeared. 4.Small plants grew on the water.6. Plants began to grow on dry land.8. Water appeared on the earth10. The universe began with a “Big Band”.12. Mammals appeared.

13、831091151741262Can you put the order of development of life into a time line?Ex.2 on P27How life began on earth is one of the biggest puzzles that scientists found hard to solve.What other puzzles are hidden in the passage?Ex.5 on P27How does the universe(earth) form?Why did the earth cool down?Why

14、did water disappear on other planet?How did the dinosaur disappear ?summary After the “big bang”, the earth was still just a cloud of _,it _loudly with fire and rock, which were _ to produce the_, water vapour and other gases. Then _ began to appeared on the earth. dustexplodedin timecarbonwater _ i

15、n water are considered to be the earliest lives on the earth. The O2they supplied encouraged the lives of_. Slowly green plants grew on land, which were followed by _like insects & _. When the plants grew into_, _ appeared. Then _ developed but disappeared later, which made the rise of a totally dif

16、ferent animal,_, possible, and finally _ spread all over the world.shell-fish and fishamphibiansforestsreptilesdinosaursmammalhumansThe small plantsland animals 1. Remember the improtant words and expressions in the passage. 2. Read the text again and find out your difficult points. 3. Finish the exercise on the book.Homework: