人教版必修三unit4 reading.ppt

1、Unit 4 Astronomy: the science of the stars,人教版英語 必修三 unit4 編者：內(nèi)蒙古巴彥淖爾市奮斗中學(xué) 英語組 賈魏巍,天文學(xué) 天文學(xué)家 太陽系 原子 猛烈的；激烈的 二氧化碳 大氣層 連鎖反應(yīng) 氧氣 水生有殼動物 兩棲動物 恐龍 哺乳動物,Astronomy,Astronomer,Solar system,Atom,Violent,Carbon dioxide,Chain reaction,Amphibian,Oxygen,mammal,Dinosaur,Shellfish,Atmosphere,new words,The Solar syste

2、m,eight planets many comets other objects,Warming Up,There used to be nine planets in the solar system. Recently scientists have decided that one of them can no longer be considered a planet. Do you know the name of that planet? Do you know why they removed it?,Pluto. Scientists now think it is too

3、small to be called a planet.,Pluto,sun,Mercury,Venus,Earth,Mars,Jupiter,Saturn,Uranus,Neptune,Pluto,水星,金星,火星,木星,土星,天王星,海王星,冥王星,The Solar system,Each religion and culture has its own ideas about how life began on earth. What do you know?,Pre-reading,In china, Pangu separated the sky from the earth,Th

4、e Goddess Nvwa mended the heaven and created human beings.,In china ：,In other countries：,The Holy Bible says that the God created the world and the human beings,In India： Brahma(梵天) is the creator(創(chuàng)造者) of the universe and all living beings（生物）, Big Bang,Water Air sun,Water is the headspring(源泉)of l

5、ife.,?,What is the most important thing for all types of life on the earth?,How Life Began on the Earth,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 imp

6、act on the earth. Para. 5 The development of plants and animals on the earth.,skimming listen to the tape and match,the main idea of each paragraph,10,7,3,8,4,9,6,1,5,2,12,11,1. Insects and amphibians appeared. 3. The earth became a solid ball. 5. Reptiles appeared. 7. The earth was a cloud of dust.

7、 9. Shellfish and other fish appeared. 11. Clever animals with hands and feet appeared.,2. Dinosaurs appeared. 4. Small plants grew on the water. 6. Plants began to grow on dry land. 8. Water appeared on the earth. 10. The universe began with a Big Bang. 12. Mammals appeared.,scanning,reading for de

8、tails,Read the text and fill in the blanks in the following form.,Atoms,stars,bodies,Questions for Par.1:,Why was the earth different from other planets? A it produced a lot of heat. B.The water remained. C Water disappeared. D.It was the oldest planet.,Why was life able to develop on the earth but

9、not on other planets? A The earth had a solid shape. B. The earth did not have harmful gases in its atmosphere. C The water stayed on the earth but not on other planets. D.The earth was not too hot and not too cold.,Questions for Para.2,3:,2.water,7.Plants in the water,1.Shellfish and fish,8.Plants

10、on land,Questions for Para.4: read the passage and give the right timeline,3.Insects and amphibians,4.Reptiles,5.Dinosaurs,6.Mammals,1,2,3,4,5,6,7,8,Man had evolved from apes.,Questions for Para.4,The humans came into being and spread all over the world.,what problem do human beings cause ?,A. They

11、cause global warming. B. They exist everywhere on the earth. C. They find new methods of growing crops. D. They enjoy hunting and fishing.,Questions for Para.5:,Summary,After the “Big Bang”, the earth was just a cloud of _. It _ loudly with fire and rock, which were in time to produce _, nitrogen, w

12、ater vapour and other gases. Then small plants grew. They_ and filled the oceans and seas with_, which encouraged the later development of early _and all sorts of fish. When the plants grew into forests, _ appeared for the first time. They produced young generally by _ eggs.,dust,exploded,carbon,mul

13、tiplied,oxygen,Shellfish,reptiles,laying,Post reading,When dinosaurs disappeared, _ became more important. Small clever animals with _ appeared and _ all over the world. As time went by they covered the earth and they are putting too much carbon dioxide into the _, which _ heat _ escaping from the e

14、arth into space. Whether life will continue on earth for millions of years to come will _ whether this problem can be solved.,hands and feet,depend on,from,prevent,atmosphere,spread,mammals,Summary,Discussion,What can we do to deal with the problem caused by human beings,You can use the following words and phrases and sentences to help you:,global warming carbon dioxide atmosphere prevent from harmful in turn depend on as a result thus What we can do is to What we cant do is to,solar energy,plant trees,recycle rubbish,p