How_life_began_on_the_earth_阅读(公开课).PPT

1、2021/3/291 公开课公开课 附城中学附城中学 唐秀霞唐秀霞2021/3/292How Life Began on the Earth2021/3/293Do you know how life began on earth is explained in different religions and cultures? 2021/3/294Pangu separates the sky from the earth 2021/3/295God created the world in seven days2021/3/296Some legends about the beginni

2、ng of universe.What is the scientific theory about the beginning of life on the earth?That is the topic we are going to talk about.Follow me, We will get it2021/3/297 2021/3/298Read the passage quickly to catch the main idea of the passage :Topic:_Key words:_-_-_-_2021/3/299Key words:1._2._3._4._ To

3、pic: _ How Life Began on the earthairwaterplantsanimals2021/3/2910New words The universebegan with a“Big Bang”.2021/3/2911 Stephen William Hawking,put forward a theory about black holes.理论，学说i:ri：2021/3/2912The most powerful force in the univers is atomic bomb 原子的(adj)atom原子tm2021/3/2913Carbon ,nitr

4、ogen,water vapour and other k:bn naitrdn veipgases are to make the earhs atmosphere.tmsfi2021/3/2914 mltiplaiPlants multiplied and filled the oceans and sea with oxgen2021/3/2915amphibiansmfibinAmphibians can live in the water as well as on land.2021/3/2916Reptiles produced young generallybylaying e

5、ggsreptail2021/3/2917 mmlMammals like monkeysgave birth to young baby animals and produced milk to feed them.2021/3/2918 ,fndmentlWater was to be fundamental to the development of life.be base on2021/3/2919Water allowed the earth to dissove hurmful gases and acids into the oceans. This produced a ch

6、ain reaction,which made it possible for life to develop.2021/3/2920 k:bn daiksaidThey are putting too much carbon dioxide into the atmosphere ,which prevents heat from escaping the earth into space2021/3/2921in time 及时及时lay eggs 下蛋下蛋give birth to 分娩分娩in one turn 轮到某人轮到某人prevent .from.=stop from2021/

7、3/2922Read the text quickly and match the main idea for each paragraph.2021/3/2923Para. 1 The formation(形成形成) 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 impact on the earth. Para.

8、5 The development of plants and animals on the earth.2021/3/2924 2021/3/29252021/3/29262021/3/2927A cloud of dustA cloud of dustCombine into a Combine into a solidsolid ball ballExplodeExplodewith fire & rockwith fire & rock(produce H(produce H2 2O, COO, CO2,2,OO2, 2, NN2, 2, other gases)oth

9、er gases) atmosphereatmosphereCool downCool downwater appearedwater appeared Life began Life began and and developeddevelopedplants-animals2021/3/2928Fish and shellfish2021/3/2929amphibians2021/3/2930retiles2021/3/2931dinosaurs2021/3/2932Mammals2021/3/2933human beings2021/3/2934 Work in pairs: Put t

10、he order of developmentof life into a timeline first according to your common sense, and then according to the reading passage. 2021/3/293510 73 8 4 9 6 1 5 2 12 111. Insects and amphibians appeared.3. The earth became a solid ball.5. Reptiles appeared.7. The earth was a cloud of dust.9. Shellfish a

11、nd 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.2021/3/2936 True (T) or False (F).1. The earth

12、 appeared before the Big Bang happened.2. The original atmosphere consisted of nitrogen and oxygen. 3. The main difference between the earth and other planets is that there is water on the earth. 4. Life began in water and then on land.FFTTDiscuss in groups:2021/3/29375. Mammals appeared before the

13、development of dinosaurs.6. Dinosaurs could give birth to young baby animals and produced milk to feed them. 7. Human beings produce too much carbon dioxide which causes the global warming on the earth. 8. According to the text, human beings would disappear in the end. FFTF2021/3/29381. What was the

14、re on the earth before life could begin? 2. Why do scientists think there has never been life on the moon? 3. Why did animals first appear in the seas? 4. Why did green plants help life to develop? 5. Why were mammals different from other animals?Answer the following questions :2021/3/29391. What wa

15、s there on the earth before life could begin? Water _, carbon _, o_, nitrogen and other gases.vapourdioxideoxygen2021/3/29402. Why do scientists think there has never been life on the moon? Because there is no _ on the moon.3. Why did animals first appear in the seas? Because water allowed the earth

16、 to _into the oceans and seas. waterdissolve harmful gases2021/3/29414. Why did green plants help life to develop? Because green plants can take _ from the atmosphere and fill the air with _carbon dioxideoxygen.2021/3/29425. Why were mammals different from other animals? They were different because

17、they gave birth to young baby animals and produced milk to feed them2021/3/2943III. Read the text and fill in the blanks in the following form.TimeWhat happenedBig Bang_ began to form and combine to create stars and other bodies.Atoms2021/3/2944Between 4.5 and 3.8 billion years agoDust settled into

18、a solid and _ globe.The earth exploded to produce its_ .The continued _ of water allowed the earth to dissolve harmful gases and _ into the oceans and seas.violentatmospherepresenceacids2021/3/2945Many millions of years laterThe first small plants on the surface of the water produced_ .Early _ and a

19、ll sorts of fish appeared.Green plants began to grow on land. Insects and_ appeared.oxygenshellfishamphibians2021/3/2946Many millions of years later_ appeared and they laid eggs.Dinosaurs developed, laid eggs and _ for more than 140 million years.Mammals rose and _ babies.Reptilesexistedgave birth to2021/3/2947About 2.6 million years agoSome small _ animals with hands