Book 3 Unit 4 Astronomy:,the science of the stars,Learning goals,Learn how life began on the earth. Learn the evolution of life. Learn words and expressions in this unit. Reveal the importance of environment,protecting.,Spring comes and all living things come back to life.,Warming up,Enjoy a video,What happened to the earth? Is there any life at that time?,Leading in,How Life Began on the Earth,Book 3 Unit 4 Reading,Fast reading,1. Read the passage quickly and find the main idea.,A brief introduction on how _ and how_.,the universe developed,life began on the earth,the earth exploded the universe developed water appeared life began on the earth,2. Match the main idea of each paragraph,Para 1,Para 2,Para 3,Para 4,B. The development of plants and animals,A. A theory about how the universe was formed.,E. The formation of the earth,D. The importance of water for life,Para 5,C. The arrival of human beings and their effects on the earth,Before life appeared,Life appeared based on the earth and water,Human beings,Period 1,Para. 1 Universe,The universe began with a _ that threw matters in all directions. After that, _ began to form and combine to create stars and other bodies.,The Big Bang,atoms,Careful reading,big bang,Part 2,1). What were produced after the earth exploded?,Water vapour, carbon dioxide, oxygen, nitrogen and other gases.,Para. 2-4,Read paragraph 2 and 3, answer the following questions.,A. It produced a lot of heat B. The water remained C. Water disappeared D. It was the oldest planet,2). Why was the earth different from the other planet?,B,2. Read paragraph 4, underline all the lives in this paragraph and put them in correct order.,( ) A Insects and amphibians appeared. ( ) B Dinosaurs appeared. ( ) C Small plants grew on the water. ( ) D Reptiles appeared. ( ) E Plants began to grow on dry land. ( ) F Shellfish and other fish appeared. ( ) G The plants grew into forest ( ) H Mammals appeared.,4,1,6,5,3,2,8,7,green plants,insects,3. Retell the development of life together.,amphibians,reptiles,dinosaurs,mammals,forest,fish,small plants,The arrival of humans and their effect on the earth,Para. 5,Human beings,The earth may become too _to live on.,too much_,hot,carbon dioxide,Checking,True or false,1. It was not until between 4.5 and 3.8 billion years ago that people knew what the earth was to become.,2. Water began to appear on the surface of the earth before gases were produced.,3. The global warming will have a great effect on human beings.,T,F,T,after,4. Mammals were different from life forms in the past, because they produced young by laying eggs.,F,gave birth to young baby animals,After the earth _(explode)with fire and rock, it produced water vapour, carbon dioxide, _(make) the earths atmosphere._ the earth cooled down, water began to appear.,exploded,Summary,Small plants and early fish began to appear. Then green plants grew on land. Later land animals appeared. Some were insects, _ were amphibians. _the plants grew into forests, reptiles appeared _the first time. Dinosaurs developed and existed for a long time. However, they _ (appear)with a mystery. After that mammals became more important, _ were different from life forms in the past. Finally, human came into _(exist), but they did_ (harmful) to the earth.,making,others,When,harm,As,for,语法填空,existence,disappeared,which,Work in groups and choose the proper character you like to emerge(呈现) the development of life. Use your imagination and act out.,Role play, ,Do not throw rubbish onto the ground. Do not waste water. Stop using plastic bags for shopping. Make classrooms less noisy.,Suggestions for you:,Homework 1. A composition about what we can do to take care of the earth. 2. Read and retell the passage to learn the important and difficult language points. 3. Finish Ex book on P 53-56.,Thank you !,