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1、Unit 4 HOW LIFE BEGAN ON THE EARTH,Nobody knows what caused the Big Bang. But it was the event that created our universe. The universe began with a Big Bang.,The Big Bang,Lead in,1. Do you know the origin of life on earth? 2. Each religion or culture has its own ideas about how life began on earth.,
2、In Chinese culture,_ separates(分) the sky from the earth.,Pangu 盘古,sky,earth,Saying 1,_ made human beings.,N wa (女娲),Saying 2,In western countries: _ created the world and all living things.,God (上帝),Saying 3,Life was brought to the earth by ET from outer space.,Saying 4,The ancestors of human being
3、s are monkeys.,Saying 5,Reading HOW LIFE BEGAN ON THE EARTH,Prediction,Look at the picture. Can you predict what our text will talk about?,Skimming,Task 2 summarize the main idea,The text mainly tells us the formation(组成）of _and the _of life on it.,the earth,development,Whats the writing style of th
4、e text?,A. Narration 记叙文 B. Explanation 说明文 C. Essay 散文 D. Argumentation 议论文,Task 1,Scanning,Read the passage on P25 quickly, and match the main idea of each paragraph.,Para.1 Para.2 Para.3 Para.4 Para.5,A theory about how the universe was formed,The formation(形成) of the earth,The importance of wate
5、r for life,The development of plants and animals,The arrival of humans and their effects on the earth,Scanning,Part1: The development of the earth,Part2:The development of life.,Careful reading,atoms,a violent solid globe,Big Bang,atmosphere,Water,oceans and seas,1. Choose the words to fill in the b
6、lanks to retell the development of the earth and water.,Part 1 (Para.1-3),atoms,Combine into,Explode with fire and rock,dissolve harmful gases into,Big Bang,a violent solid globe,atmosphere,water,oceans and seas,Cool down,Big Bang,atoms,a violent solid globe,atmosphere,Water,oceans and seas,2.Why wa
7、s the earth different from other planets ? (Para.3),A. It produced a lot of heat. B. Water remained. C. Water disappeared. D. It was the oldest planet.,So water is important to the earth . No water , no earth.,Part 2 (para45) The development of life Put the development of life in order.,A. insects a
8、nd amphibians appear B. reptiles appear C. shellfish and all sorts of fish appear D. dinosaurs appear E. small plants grow on the surface of the water F. plants begin to grow on land G. mammals (including humans) appear,E,C,F,A,B,D,G,Para. 5,Can you find one sentence in this paragraph to describe th
9、e picture here?,They are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth into space.,The earth may become too hot to live on.,Now you are a reporter from CCTV, you have a chance to interview a famous astronomer. You will talk about the earth and
10、give advice on how to protect the earth. (work in groups),Role Play,How did the earth come into being? What does the atmosphere consist of(组成)? Whats “the Green House effect”? Does it destroy our planet? What can we do to prevent the earth from getting warm? (solar energy, plant trees, save water) ,
11、Good morning/afternoon, I am a reporter from CCTV, Im greatly honored to be here to interview a great astronomer to you ,The earth was just a cloud of _after the “Big Bang”The earth _loudly with fire and rock. They were in _to produce many things, which were to make the earths atmosphere. As the ear
12、th cooled down，water began to appear on its surface.It allowed the earth to dissolve _gases.Then life began to develop.,Summary,The first small plants _and filled the oceans and seas with oxygen. This encouraged the _of early shellfish and fish. Land animals such as insects，reptiles and dinosaurs an
13、d so on appeared after green plants appeared. Small clever animals _all over the earth. They are putting too _carbon dioxide into the atmosphere, which _heat from the earth into space. Whether life will continue on the earth for millions of years to come will _on whether this problem can be solved.,
14、The earth was just a cloud of _after the “Big Bang”The earth _loudly with fire and rock. They were in _to produce many things, which were to make the earths atmosphere. As the earth cooled down，water began to appear on its surface.It allowed the earth to dissolve _gases.Then life began to develop.,S
15、ummary,dust,exploded,time,harmful,The first small plants _and filled the oceans and seas with oxygen. This encouraged the _of early shellfish and fish. Land animals such as insects，reptiles and dinosaurs and so on appeared after green plants appeared. Small clever animals _all over the earth. They are putting too _carbon dioxide into the atmosphere, which _heat from the earth into space. Whether life will continue on the earth for millions of years to come will _on whether this problem can be solved.,multiplied,development,spread,
