unit how life began on the earthreadingPPT課件

1、海王星海王星 Saturn Saturn 水星水星Uranus Uranus 金星金星Venus Venus 地球地球Earth Earth 火星火星Mars Mars 木星木星Mercury Mercury 土星土星Jupiter Jupiter 天王星天王星Neptune Neptune 第1頁/共44頁A Quiz Game 1. How old is the earth? A. About 3.5 billion years B. About 4.5 billion years C. About 5.5 billion years D. About 6.5 billion years

2、2. _ of the earth surface is covered by water. A. 20% B. 30% C. 50% D. 70%第2頁/共44頁3. How many planets are there in the Solar System? A. 6 B. 7 C. 8 D. 9 4. What is the total population of humans on the earth? A. About 3.5 billion B. About 4.5 billion C. About 5.5 billion D. About 6.5 billion第3頁/共44頁

3、5. How long does the rotation (自轉) of the earth take? A. 12 hours B. 24 hours C. a month D. 365 days6. Which continent is the smallest? A. Africa B. North America C. South America D. Oceania 7. On what day is the Earth day celebrated? A. April 22 B. May 4 C. August 21 D. November 11第4頁/共44頁8. Which

4、ocean is the largest? A. The Pacific Ocean B. The Arctic Ocean C. The Indian Ocean D. The Atlantic Ocean9. Which country has the largest area? A. Canada B. China 第5頁/共44頁Step 2 Pre-reading1. How did the universe begin?2. How did life begin on the earth? There are different legends(傳說) of how the uni

5、verse and life began in different cultures: In Chinese culture第6頁/共44頁Pangu separates the sky from the earth. 第7頁/共44頁 中國神話傳說中有盤古開天地的說法。巨人盤古用一把利斧劈開混沌, 將天地分開。死后, 他的氣息化成風和云, 聲音變成轟轟的雷聲, 左眼化為太陽, 右眼化為月亮, 手足與四肢變成大地的四極與五方的名山, 血液化成江河,筋脈鋪成道路, 肌肉形成田地, 須發(fā)成為星星, 牙齒和骨骼化為金屬、珍珠、玉石, 汗水成為滋潤萬物生長的甘霖和雨露。第8頁/共44頁Nvwa mad

6、e humans.第9頁/共44頁In western culture: God created the world in seven days第10頁/共44頁Do you know what a scientific idea is?1. The universe began from the Big Bang. 第11頁/共44頁2. Life first began in the sea on the earth. 第12頁/共44頁3. Life was brought to the earth by ET from outer space. 第13頁/共44頁Whats the w

7、riting style of the text?A. Narrative 記敘文B. Explanation 說明文C. Essay 散文第14頁/共44頁 1. Whats the main idea of the text? 2. How many parts can the text be divided into? Whats the main idea for each part?Step 3: ReadingFast-reading第15頁/共44頁Para.1 Para.2Para.3Para.4Para.5A_ about how the universe was forme

8、dThe_ of the earthThe importance of_ for lifeThe_ of plants and animalsThe arrival of _ and their effects on the earththeoryformationwaterdevelopmenthumansHow life began on the earth第16頁/共44頁Lets get to know how life began on the earthTask two: Read paragraph 1-3 quickly by yourselves.After the “Big

9、 Bang”,what happened on the earth ?第17頁/共44頁1. Who knows how life began on the earth exactly?A. Scientists. B. Astronomers.C. No one. D. Aliens (外星人外星人).2. 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 pl

10、anet.第18頁/共44頁3. Why was life able to develop on the earth but 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.第19頁/共44頁Stage 1: The

11、 development of the earth(1) After the Big Bang, what happened? a cloud of dust a violent solid ball 第20頁/共44頁exploded with fire and rock Produced carbon,nitrogen, water vapor and gases(2) What happened next?第21頁/共44頁(3) What did water vapour and gases make?the earths atmosphere第22頁/共44頁Water appear

12、ed which is important for the beginning of life on the earth. (4) What appeared on the earth then?第23頁/共44頁(5) What did the water form?oceans and seas第24頁/共44頁retell how the earth and water come aboutBig BangA cloud of dustA solid globeExploded loudly with fire and rockcarbon, nitrogen, water vapor

13、and other gasesthe earths atmosphereThe earth cooled downWater appeared第25頁/共44頁Read paragraph 4 and 5 quickly, and find out the order of development of life on the earth第26頁/共44頁arrival of small plants in waterWhat life developed after water appeared?early shellfish and all sorts of fishStage 2: Th

14、e development of life in water第27頁/共44頁Stage 3: The development of life on land.green plants on land insects on landamphibians on land and in the water(1) What life developed after the life in water?第28頁/共44頁 reptiles on land dinosaurs on land(2) What life developed after forests appeared? How do re

15、ptiles produce young? by laying eggs第29頁/共44頁mammals on land(3) What life developed after dinosaurs? How do mammals produce young? by giving birth to baby animals and producing milk to feed them.第30頁/共44頁 humans came into beingStage 4: The development of humans What life developed after mammals?第31頁

16、/共44頁They developed new methods of growing food, hunting,and moving around. 1. What did humans develop?They are putting too much carbon dioxide into the atmosphere.2. What problem are humans causing?第32頁/共44頁 Step 4 Comprehending1. Why was the earth different from other planets? 2. Why was life able

17、 to develop on the earth but not on other planets? 3. Why was it necessary for plants to grow before animals? 4. What problem is caused by human beings? The water remained.The earth did not have harmful gases in its atmosphere.Plants provided oxygen for animals to breathe.They cause global warming.第

18、33頁/共44頁According to the pictures, have a try to retell the development of life.第34頁/共44頁第35頁/共44頁第36頁/共44頁Put the order of development of life into a time line.A. insects and amphibians appearB. a solid ballC. reptiles appear D. a cloud of dustE. shellfish and other fish appearF. dinosaurs appear G. small plants grow on the waterH. plants begin to grow on dry landI. presence of waterJ. mammals (including humans )appearDBIGEHACFJ第37頁/共44頁Discussion Why is it wrong in films and stories to show dinosaurs and people together?Dinosaurs died out long before human