【公开课课件】必修三Unit-4-How-life-began-on-the-earth

Reading:How life began on the earth,Goal:,Methods:Reading and discussing,Scanning,Scan the passage and find out the answer to the question:,When did human beings appear?,Scanning,Q:When did human beings appear?,A:About 2.6 million years ago.,About 2.6 million years ago,human beings appeared.,4.6 billion years ago,Skimming,Read the passage carefully and find out the main idea for each paragraph.,Para.1,Para.2,Para.3,Para.4,Para.5,The universe,began with a,_.,“Big Bang”.,Para 1,Skimming,Para.1,Para.2,Para.3,Para.4,Para.5,A widely accepted theory about the formation of the universe.,Para 1,Skimming,Read Para 2 and try to answer the following question:,After the Big Bang,what happened?,Para 2,a,cloud,of,dust,a solid ball,atmosphere,5,4,settled into,cooled down,填动词,Para 2,_,fire and rock,exploded with,_,water,vapor and gases,1,2,3,_,produced,_,water,_,appeared,Skimming,Para.1,Para.2,Para.3,Para.4,Para.5,A widely accepted theory about the formation of the universe.,The formation of the earth.,Para 2,What did the water do?,It allowed the earth to dissolve harmful gases and acids into the oceans and seas.,Para 3,Skimming,Para.1,Para.2,Para.3,Para.4,Para.5,A widely accepted theory about the formation of the universe.,The formation of the earth.,The importance of water for life.,Para 3,1.,2.,3.,4._,(on land),5.,6.,7._,8._,(on land,),9._,small _ in water,_,and all sorts of fish,green plants on land,_(on land and in water),forests,(on land),(on land),plants,shellfish,amphibians,reptiles,mammals,Para 4,insects,dinosaurs,Skimming,Para.1,Para.2,Para.3,Para.4,Para.5,A widely accepted theory about the formation of the universe.,The formation of the earth.,The importance of water for life.,The development of plants and animals on the earth.,Para 4,Human beings appeared and spread.,Para 5,They are putting too much _ into the atmosphere,which prevents heat from escaping from the earth into space.,carbon dioxide,What main problem is caused by human beings?,Para 5,They cause global warming.,Skimming,Para.1,Para.2,Para.3,Para.4,Para.5,A widely accepted theory about the formation of the universe.,The formation of the earth.,The importance of water for life.,The development of plants and animals on the earth.,The arrival of humans and their impact,on the earth.,Para 5,10,7,3,8,4,9,6,1,5,2,12,11,1.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 hands 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.,Put the order of the development into a timeline.,Discussion,water,What can we do,to protect,the earth?,forests,animals,plants,atmosphere,water,Homework,Write an article on what we can do to protect the earth according to the discussion(At least 3 aspects,about 150 words).,Thank you!,