人教版新课标英语必修三第四单元Reading PPT课件.ppt

1、Welcome,Unit 4,Astronomy:,the science of the stars,solar system太阳系,Sun,Venus,Mercury,Mars,Jupiter,Saturn,Earth,Pluto,Neptune,Uranus,But scientists now think Pluto is too small to be called a planet.,Pre-reading,Do you know how our life began on the earth?Do you know any ancient idea about the beginn

2、ing of the universe?,Big Bang,HOW LIFE BEGAN ON THE EARTH?,Reading,1. What is the original earths atmosphere made up of? 2. What is the fundamental to the development of life? 3. Which kind of life-being first appeared on the earth, plants or animals? 4. Main idea of each paragraph,Scanning,Scan the

3、 passage quickly to answer the following questions.,carbon, nitrogen, water vapour, and other gases,2. what is fundamental to the development of life?,Water,1. What is the original earths atmosphere made up of?,3. Which kind of life-being first appeared on the earth, plants or animals? Why?,At first

4、, small plants began to appear on the surface of the water, they produce oxygen, which encouraged the later development of early shellfish and all sorts of fish.,4.Choose the main idea for each paragraph ( )The arrival of humans and their impact on the earth. ( )The formation of the earth. ( )The de

5、velopment of plants and animals on the earth. ( )A widely accepted theory about the formation of the universe. ( )The importance of water for life.,5,4,2,1,3,Passage structure,Main body,Para 1:,Para 2: Para 3: Para 4:,Para 5:,A widely accepted theory about the formation of the universe.,The formatio

6、n 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.,Read the passage carefully and analyse its structure:,earth, atmosphere and water,life development,Human beings,（ ）A Insects and amphibians appea

7、red. （ ）B Dinosaurs appeared. （ ）C The earth became a solid ball. （ ）D Small plants grew on the water. （ ）E Reptiles appeared. （ ）F Plants began to grow on dry land. （ ）G The earth was a cloud of dust. （ ）H Water appeared on the earth. （ I Shellfish and other fish appeared. （ ）J The universe began w

8、ith a “Big Bang”. （ ）K Clever animals with hands and feet appeared. （ ）L Mammals apeared.,5,10,6）,2,9,4,8,3,7,1,Detailed reading,Put the order of development of life into a time line.,12,11,Post reading,After reading the passage, discuss the following questions.,1. Why was the earth different from t

9、he other planets?,2. Why is it wrong to show films with dinosaurs and people together?,Because the water remained on the earth.,Because dinosaurs died out long before human beings developed on the earth.,Post reading,After reading the passage, discuss the following questions.,3. What problem is caus

10、ed by human beings?,Human beings causes global warming.,Lets 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. Marine animals came into being.,Some animals (amphibian & insects

11、) came to land.,Reptile appeared.,dinosaurs,Mammals,Man had evolved from apes.,They developed new methods of growing food, hunting and moving around. As time went by they covered the earth and have become the most important animals on the planet.,We are making the world better.,We are making the wor

12、ld worse.,A,B,Discussion,developed new methods of growing food,(1) What humans developed?,developed new methods of hunting,developed new methods of moving around,Greenhouse effect,(2) But they are not taking care of the earth very well. What problem are humans causing ?,putting carbon dioxide into the atmosphere,the earth may become too hot,As a student, what little things can we do for the earth?,Discussion,solar energy,plant trees,recycle rubbish,prevent desertification,save water,purify air,Whether life will continue on the earth depends on human beings.,Only if we care wi