B3 Unit 4 Astronomy

1、Book III Unit 41.Whats the meaning of the word “Astronomy”?I. Warming upA. the science of stars;B. 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 system 恒星恒星 行星行星 太陽太陽 月球月球 地球地球 太陽系太陽系 3. How many p

2、lanets are there in the solar system? 4. The eight planets in solar system. Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune1) 水星水星2) 金星金星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There used to be 9 planets.Scientists now think Pluto is too small to be called a planet.Mercury Venus Earth M

3、ars Jupiter Uranus Saturn Neptune6. Put them in correct order .II. Pre-reading1.Have you ever asked your mother, “Mom, where do humans come from”?2. Nearly everybody has this or that puzzle:How do human beings come into being?How does the earth come into being?3. In China, there are two legends abou

4、t these puzzles. 盤古開天辟地盤古開天辟地 女媧補天造人女媧補天造人 4. In the western culture, who creates everything in the world?1.Do you believe in such stories? Are they based on science? So, 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

5、 may tell us the _ of life on the earth.1. Conclude the main idea of each paragraph.1) A widely _ about the _ of the universe.2) The formation of the _.3) The _ of water for life.4) The development of _ and _ on the earth.5) The arrival of _ and their _ on the earth.The text mainly tells us the _ of

6、 the earth and the _ of life on it.2. The main idea of Reading.theoryoriginearthimportanceplantsanimalshumans effectformationdevelopmentIII. Fast-reading Structure This text can mainly be divided into two stagesStage 1 : The formation of the earthStage 2 : The development of life(para _)(para _)4,51

7、,2,3Stage 1: The formation of the earth(1) After the Big Bang, what was the earth like?(2) What happened to the solid globe?(3) What did the water vapour and gases make?(4) What appeared as the earth cooled down?(5) Why is water fundamental to the beginning of life?Stage 1: The formation of the eart

8、h(1) After the Big Bang, what was the earth like? a cloud of dust a solid globe exploded with fire and rock produced water vapour and gases(2) What happened to the globe?(3) What did the water vapour and gases make?the earths atmosphere Water appeared(4) What appeared as the earth cooled down? Accor

9、ding to many scientists, why is water fundamental to the beginning of life? Because water allowed the earth to dissolve harmful gases and acids into oceans and seas. 1.What life appeared first on the earth?2.What life developed in water next?3.What about the life on land?4. What two animals develope

10、d after forests appeared?5. What life developed after dinosaurs?Stage2 The development of lifeStage2 The development of life extremely small plants appeard on the surface of water 1.What life appeared first on the earth?Shellfish and all sorts of fish 2.What life developed in water next? green plant

11、s land animals3.What about the life on land?What are the first land animals? reptiles dinosaurs 4.What two animals developed after forests appeared?mammals5.What life developed after dinosaurs? “small clever animals”6. What life developed after mammals? 1.Who are the small clever animals with hands

12、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 fill in the blanks?23456789101 small plants in watershellfish a

13、nd all sorts of fish insects reptilesamphibiansmammalsdinosaurs humansplantsanimalsGreen plants on landforests1. Insects and amphibians appeared. 3. The earth became a solid ball.5. Reptiles appeared. 7. The earth was a cloud of dust9. Shellfish and other fish appeared.11. Clever animals with hands

14、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 Bang”.12. Mammals appeared.831091151741262Can you put the order of development of life into a time line?Ex.2 on P27summary Aft

15、er 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 appear on the earth. dustexplodedin timecarbonwater _ in 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