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Part One:Lead in What is this?,Which planet is its home?,This is ChangJiang7.It is an alien（外星的） dog from outspace.,Can you guess?,1,海王星 Neptune,水星 Mercury,金星 Venus,地球 Earth,火星 Mars,木星 Jupiter,土星 Saturn,天王星 Uranus,2,Pluto,Scientists think Pluto is too small to be called a planet.,Goodbye!,3,Life is beginning,Unit4 Reading How Life Began on the Earth,4,Part Two:A guessing game sharp eyes, remeber quickly,What can you see in the video?,5,Big Bang,globe,atom,violent surface,water,reptile,alien,eggs,mammals,fish,human beings,dinosaur,cowboy,atmosphere,6,Main idea,After watching the video clip, what is the main idea of this passage?,A brief introduction on how the _developed and how _ began on the earth.,life,earth,7,Para.1 Para.2 Para.3 Para.4 Para.5,A theory about how the universe （宇宙）was formed,The formation(形成)of the earth,The importance of water for life,The development of plants and animals,The arrival of humans and their effects on the earth,Part1: The development of _,Part2:The development of_,Part Three:Fast reading,the earth,life,8,Part Four：Careful Reading,Stage 1: The development of the earth(para1-3) Task 1:Fill in the form on learning plan paper. (para1-2),(tips:Read the passage carefully , find some detailed information),9,Atoms,a cloud of dust,a solid globe,create,10,violent,atmosphere,produce,Water,appear,cooled down,11,Big Bang,atom?,Atmosphere,A solid ball,water学.科.网.,A cloud of dust,12,Task2(para3),1.Why was the earth different from other plantes? 2.Why is water so important for the beginning of life?,13,Task2: 1.Why was the earth different from other plantes? A . It produced a lot of heat B . The water remained on the earth C . A cloud of dust was around the earth D . It was the oldest planet,14,2.Why is water so important for the beginning of life?,Because water allowed the earth to dissolve harmful gases into oceans and seas, which made it possible to develop life.,15,Task3: Read para(4-5) and put the development of life in time order. (tips:Find out and underline key phrases which can show a time line, such as .later,.ago),Stage2: The development of the life (para4-5),16,Many millions of years later, the first extremely small plants began to appear on the surface of the water. They multiplied and filled the oceans and seas with oxygen, which encouraged the later development of early shellfish and all sorts of fish. Next, green plants began to grow on land. They were followed in time by land animals. Some were insects. Others, called amphibians, were able to live on land as well as in the water. Later when the plants grew into forests, reptiles appeared for the first time. They produced young generally by laying eggs. After that, some huge animals, called dinosaurs, developed. They laid eggs too and existed on the earth for more than 140 million years. However, 65 million years ago the age of the dinosaurs ended. Why they suddenly disappeared still remains a mystery. This disappearance made possible the rise of mammals on the earth. These animals were different from all life forms in the past, because they gave birth to young baby animals and produced milk to feed them.,17,Finally about 2.6 million years ago some small clever animals, now with hands and feet, appeared and spread all over the earth. Thus they have, in their turn, become the most important animals on the planet. But they are not looking after the earth very well. They are putting too much carbon dioxide into the atmosphere, which prevents heat from escaping from the earth into space. As a result of this, many scientists believe the earth may become too hot to live on. So whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved.,18,想一想,（ ） Insects and amphibians appeared. （ ） Dinosaurs appeared. （ ） Small plants grew on the water. （ ） Reptiles appeared. （ ） Green plants began to grow on land. （ ） Shellfish and other fish appeared. （ ） Clever animals with hands and feet appeared. （ ） Mammals appeared.,1,2,3,4,5,6,7,8,19,Greenhouse effect,Task4:What problem is caused by human beings?(para5),putting too much carbon dioxide into the atmosphere,prevents heat from escaping from the earthinto space,too hot to live on,20,Whether life will continue on the earth depends on human beings.,Only if we care will we help; only if we help shall all be saved!,21,Long long ago, there is an ancient city called Handan.,Handan Congtai,22,Fuyang River,23,亲，我是康德，我在雾霾中,24,空气污染，光靠戴口罩可不管用,25,26,Part Five: Discussion,Discuss in groups and give a report to the class.,How can we control the air pollution and make our city a better place to live in?,27,summary,After the “big bang”, the earth was still just a cloud of _,it _loudly with fire and rock, which were _ to produce the_, water vapour and other gases. Then _ began to appear on the earth.,dust,exploded,in time,carbon,water,28,_ in water are considered to be the earliest lives on the earth. The oxygen supply encouraged the lives of_ _. Slowly_ grew on land, which were followed by _ like insects & _. When the plants grew into_, _ appeared. Then _ developed but disappeared later, which made the rise of a totally different animal,_, possible, and finally _ spread all over the world.,shell-,-fish and fish,amphibians,forests,reptiles,dinosaurs,mammal,humans,The small plants,land animals,green plants,29,Goodbye!,Many thanks!,30,
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