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1、Unit 4 Astronomy:The science of the stars,Warming up and reading,How many planets travel around the sun?Which planet is the most important for us?How is the earth different from other planets?,2,3,4,地球 _木星 _火星 _水星 _,海王星 _土星 _天王星 _金星 _,Earth,Jupiter,Mars,Mercury,Neptune,Saturn,Uranus,Venus,THE SOLAR
2、SYSTEM,Do you know how our life began on the earth?Do you know any ancient idea about the beginning of the universe?,5,6,In Chinese culture:,Pangu separates the sky from the earth.,Nuwa mended the heaven and created human beings from the clay.,7,In Western countries:,God created the world and all li
3、ving things.,8,Astronomy is one of the oldest sciences.It is the scientific study of celestial objects(such as stars,planets,comets,nebula,star clusters and galaxies)and phenomena that originate outside the Earths atmosphere(such as the cosmic background radiation).It is concerned with the evolution
4、,physics,chemistry,meteorology,and motion of celestial objects,as well as the formation and development of the universe.Astronomy is a multidisciplinary subject and usesknowledge from both math and physics.,9,Read the passage quickly and find the main idea.,A brief introduction on how the universe d
5、eveloped and how life began on the earth.,10,Read the whole passage quickly and match the main idea of each paragraph.,Para.1 Para.2Para.3Para.4Para.5,The importance of water The formation of the universe The arrival of human beings The formation of the earth The development of plants and animals,11
6、,Para 1:,Para 2:Para 3:Para 4:,Para 5:,Read the passage carefully and analyse its structure.,earth,atmosphere and water,life development,human beings,12,Read Para.1 and answer the following questions,How did the universe begin?2.What happened after the“Big Bang”?3.What does“bodies”mean here?()A.Pers
7、ons or animals bodies B.Planets and stars,No one knows exactly how the earth began.,After that,atoms began to form and combine to create stars and other bodies.,B,13,Read Para.2 and answer the following questions,1.What was the earth like for several billion years after the Big Bang?2.What was the e
8、arth like between 4.5 and 3.8 billion years ago?,Just a cloud of dust.,A solid globe.,14,Read Para.3 to tell whether the following sentences are true or false.,()1.Water on the earth disappeared later.()2.Water was necessary and important to the development of life.()3.Water was helpful in dissolvin
9、g the harmful gases and acids into the oceans and seas.,F,T,T,15,1.Why was the earth different from the other planets?2.Why is water so important for the begin-ning of life on the earth?,Because water remained on the earth,but other planets have no water.,Because water allowed the earth to dissolve
10、harmful gases into oceans and seas.,16,life,small plants in the water,green plants on land,insects on land,mammals on land,1,2,1,2,3,plants,animals,Read Para.4-5 to find the development of life.,17,life,small plants in the water,green plants on land,insects on land,mammals on land,1,2,1,2,3,shellfis
11、h and all sorts of fish,amphibian on land and in water,forests,reptiles on land,dinosaurs on land,plants,animals,18,Whats the writing style of this passage?A.A story.B.An exposition.C.A argumentation.,To explain some idea or theory to people.,B,19,（）1.Insects and amphibians appeared.（）2.Dinosaurs ap
12、peared.（）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
13、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.,12,11,20,We are making the world better.,Discussion,We are making the world worse.,21,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!,solar energy,plant trees,recycle rubbish,prevent desertification,save water,purify air,
