人教版高一英语必修三unit4 reading精品ppt课件.ppt

,the science of the stars,Unit 4 Astronomy,Astronomy ?,Are you interested in,Step 1,A quiz on astronomy,3. Earth is the only planet moving around the sun.,Part 1: True or False,The earth moves around the sun.,T,F,2. It takes the earth one day to move around the sun.,4. There is atmosphere on the moon.,5. The earth is the only planet in the solar system which has living creatures.,a year,8 planets,no,F,F,T,Mercury 水星,Venus金星,Earth地球,Mars火星,Jupiter 木星,Saturn 土星,Uranus天王星,Neptune 海王星,Chinese Legends (传说),Pangu separated 分离the sky from the earth.His whole body then turned into all kinds of things in the universe.,盘古开天辟地,2.Try to put the right order of development of life on the earth? ? ?,1,2,3,4,5,6,7,Lets check whether we put the right order at first. Are you right?,Look at title and the pictures. Can you get some information about what we will learn from the text ?,The text may tell us the _ of the earth and the _ of life on it.,development,Pre-reading,Pre-reading,formation,Fast reading,Match the main idea with each paragraphy.,Para. 1 The formation(形成) of the 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.,Careful reading,Task one (para 1),What is the widely accepted theory in Para 1?,The universe began with a Big Bang that throw matters.bodies.,a cloud of _,Big Bang,a solid _,slowly combine,the earth _ down,it exploded loudly with _ and _,the earths _,dust,ball/globe,fire rock,atmosphere,cooled,How did the earth come into being(产生）?,Task two (para 2),Why is water so important for the beginning of life?,？,paragraph3,dissolve harmful gases and acids into the oceans and seas.,Because water allowed the earth to,What life developed after water appeared?,Paragraph4,small plants,green plants,forest,early shellfish and all sorts of fish,insects and amphibians,reptiles,dinosaurs,mammals,Now,Humans produce too much carbon dioxide , making the earth too hot to live in.,Para 5,After the clever animals (humans) became important on the earth, what happened?,Answer question,Let review the evolution of life on the earth.,After the “Big Bang”, the earth was full of water.,Original cells appeared in the ocean.,The cells in the water began to separate. Small plants came into being.,Early shellfish and all sorts of fish,Some animals (amphibian & insects) came to land.,Reptile appeared.,dinosaurs,mammals,Man had evolved from apes.,We are making the world better.,We are making the world worse.,Discussion,Because they are putting too much carbon dioxide into the atmosphere.,The earth may become too hot to live on .,The earth is becoming hotter and hotter!,solar energy,plant trees,recycle rubbish,prevent desertification,save water,purify air,What can we do to take care of the earth?,Whether life will continue on the earth depends on human beings.,（ ）1 Insects and amphibians appeared.（ ）2 Dinosaurs appeared.（ ）3 The earth became a solid ball.（ ）4 Small plants grew on the water. （ ）5 Reptiles appeared.（ ）6 Plants began to grow on dry land.（ ）7 The earth was a cloud of dust.（ ）8 Water appeared on the earth.（ 9 Shellfish and other fish appeared.（ ）10 The universe began with a “Big Bang”.（ ）11 Clever animals with hands and feet appeared.（ ）12 Mammals appeared.,8,7,5）,6,4,1,10,3,9,2,Put the order of development of life.,12,11,Sum up,The text may tell us the _ of the earth and after _ appear, the _ of life one after another on it.,formation,water,development,In the last paragraph, we know humans face seriously global warming problem, which is threatening our existence. Can you write something to call on us to protect our environment ?,Discussion,The earth we live in is becoming more and more terrible, so we must take measures to deal with it Firstly: Secondly: Thirdly: We hope the environment will become more and more beautiful.,Sample,The earth we live in is becoming more and more terrible, so we must take measures to deal with it Firstly, the government should pass laws to prevent people and factories from polluting the environment. Secondly, everyone should realize the importance of the problem and try their best to protect the environment and fight against pollution. Besides, its a good ideas to plant trees to improve the environment. We hope our earth will become more and more beautiful.,例文,The earth was just a cloud of dust whose future is _ after the “Big Bang”. Then the dust began to settle into a _ ball which is so _ and _ loudly with fire and rock, to be in time to produce many things, which make the earths _. As the earth cooled down, _ began to appear and people think it is important for the beginning of life. It allowed the earth to dissolve _ gases. Then life began to develop.,uncertain,solid,violent,exploded,atmosphere,water,harmful, ,I felt lonely and life was dull at that time., ,Nobody understood plants were the start of changes. They _ and filled the first oceans and seas with oxygen. This encouraged the _ of early shellfish and fish. Land animals such as insects, amphibians, reptiles and dinosaurs and so on _ after the first green plants appeared. Dinosaurs disappeared, which made possible the rise of _ on the earth. Then small clever animals _ all over the earth.,multiplied,development,spread,With so many friends on me, I was happy.,followed,mammals,Humans developed new _ of growing, hunting and moving around. As time went by they covered the earth. Now _ carbon dioxide has been putting into the _, which _ heat_ escaping from the earth into space. As a result, the problem of _ occurs. Whether life will continue on the earth for millions of years to come will _ whether this problem can be solved.,means,from,prevents,Now, I m worried about the future of myself and humans,depend on,too much,atmosphere,global warming,