How-life-began-on-the-earth-阅读课件(公开课

1、公开课 附城中学 唐秀霞,How Life Began on the Earth,Do you know how life began on earth is explained in different religions and cultures,Pangu separates the sky from the earth,God created the world in seven days,Some legends about the beginning of universe,What is the scientific theory about the beginning of l

2、ife on the earth,That is the topic we are going to talk about. Follow me, We will get it,How life began on the earth,Please enjoy a movie about,Read the passage quickly to catch the main idea of the passage : Topic:_ Key words: _-_-_-_,Key words: 1._ 2._ 3._ 4._,Water is the headspring of life,Topic

3、: _,How Life Began on the earth,air,water,plants,animals,New words,The universe began with a “Big Bang,Stephen William Hawking,put forward a theory about black holes,理论，学说,i:ri,The most powerful force in the univers is atomic bomb,原子的(adj,atom原子 tm,Carbon ,nitrogen,water vapour and other k:bn naitrd

4、n veip gases are to make the earhs atmosphere,tmsfi,mltiplai Plants multiplied and filled the oceans and sea with oxgen,amphibians,mfibin Amphibians can live in the water as well as on land,Reptiles produced young generallyby laying eggs,reptail,mml Mammals like monkeys gave birth to young baby anim

5、als and produced milk to feed them,fndmentl Water was to be fundamental to the development of life,be base on,Water allowed the earth to dissove hurmful gases and acids into the oceans. This produced a chain reaction,which made it possible for life to develop,k:bn daiksaid They are putting too much

6、carbon dioxide into the atmosphere ,which prevents heat from escaping the earth into space,in time 及时 lay eggs 下蛋 give birth to 分娩 in one turn 轮到某人 prevent .from. =stop from,Read the text quickly and match the main idea for each paragraph,Task 1: Skimming,While-reading,Para. 1 The formation(形成) of t

7、he earth. Para. 2 The importance of water for life. Para. 3 A widely accepted theory about the formation of the universe. Para. 4 The arrival of humans and their impact on the earth. Para. 5 The development of plants and animals on the earth,The Big Bang,A cloud of dust Combine into a solid ball Exp

8、lodewith fire & rock (produce H2O, CO2,O2, N2, other gases,atmosphere,Cool down,water appeared,Life began and developed,plants,animals,Fish and shellfish,amphibians,retiles,dinosaurs,Mammals,human beings,Work in pairs: Put the order of developmentof life into a timeline first according to your commo

9、n sense, and then according to the reading passage,Task 2: Scanning,While-reading,10,7,3,8,4,9,6,1,5,2,12,11,1. Insects and amphibians appeared. 3. The earth became a solid ball. 5. Reptiles appeared. 7. The earth was a cloud of dust. 9. Shellfish and other fish appeared. 11. Clever animals with han

10、ds and feet appeared,2. Dinosaurs appeared. 4. Small plants grew on the water. 6. Plants began to grow on dry land. 8. Water appeared on the earth. 10. The universe began with a Big Bang. 12. Mammals appeared,True (T) or False (F). 1. The earth appeared before the Big Bang happened. 2. The original

11、atmosphere consisted of nitrogen and oxygen. 3. The main difference between the earth and other planets is that there is water on the earth. 4. Life began in water and then on land,F,F,T,T,Discuss in groups,5. Mammals appeared before the development of dinosaurs. 6. Dinosaurs could give birth to you

12、ng baby animals and produced milk to feed them. 7. Human beings produce too much carbon dioxide which causes the global warming on the earth. 8. According to the text, human beings would disappear in the end,F,F,T,F,1. What was there on the earth before life could begin,2. Why do scientists think th

13、ere has never been life on the moon,3. Why did animals first appear in the seas,4. Why did green plants help life to develop,5. Why were mammals different from other animals,Answer the following questions,1. What was there on the earth before life could begin? Water _, carbon _, o_, nitrogen and oth

14、er gases,vapour,dioxide,oxygen,2. Why do scientists think there has never been life on the moon? Because there is no _ on the moon. 3. Why did animals first appear in the seas? Because water allowed the earth to _into the oceans and seas,water,dissolve harmful gases,4. Why did green plants help life

15、 to develop? Because green plants can take _ from the atmosphere and fill the air with _,carbon dioxide,oxygen,5. Why were mammals different from other animals? They were different because they gave birth to young baby animals and produced milk to feed them,III. Read the text and fill in the blanks in the following form,Atoms,violent,atmosphere,presence,acids,oxygen,shellfish,amphibians,Reptiles,existed,gave birth to,clever,dioxide,The development of life,A cloud of dust a solid ball presence of water on the water shellfish & oth