Book3Unit4reading.ppt

1、Astronomy: the science of the stars,unit4,Where do we come from? Or we can say: Who are our ancestors?,Pre-reading,Big Bang,A solid ball,Atmosphere,The earth,It was full of water.,Original cells.,The cells in the water began to separate.,water,Plants in the water,Shellfish and fish,Plants on land,In

2、sects and amphibians,Reptiles,Dinosaurs,Mammals,Man had evolved from apes.,Do you know each religion or culture has its own ideas about the beginning of the universe?,Pangu separates the sky from the earth,Other legends about the beginning of universe,Day 1: God spoke and separated light from darkne

3、ss creating Day and Night Day 2: God spoke and separated the water creating sky and ocean Day 3: God spoke and created dry land,上帝创世说：,Day 4: God spoke and created the sun, moon and stars Day 5: God spoke and created living creatures in the air and sea Day 6: God spoke and created the land animals a

4、nd man Day 7: God rested and blessed this day calling it Holy,India Brahma(婆罗门) is the god first represented in the Hindu Triad. He is the creator of the universe and all living beings are said to have evolved from him.,Reading Listen to the tape with books closed and choose the best answers. Why wa

5、s the earth different from other planets? It produced a lot of heat. The water remained. Water disappeared. It was the oldest planet.,B,2.Why was life able to develop on the earth but not on other plants? The earth had a solid shape. The earth did not have harmful gases in its atmosphere. The water

6、stayed on the earth but not on other plants. The earth was not too hot and not too cold.,C,3.Why was it necessary for plants to grow before animals? Animals needed plants to protect them from the sun. Plants provided oxygen for animals to breathe. Animals could hide from hunters in forests. It was e

7、asier for plants to grow.,B,4. What problem is caused by human beings? They exist everywhere on the earth. They cause global warming. They find new methods of growing crops. They enjoy hunting and fishing.,B,Scan the passage and finish the following True or False exercises.,1) The explosion of the e

8、arth produced water vapor, which turned into water when the earth cooled down. 2) Animal appeared before plants. 3) The earth may become too hot for life to live on it.,(T),(F),Para.3 Sentence 2,(T),Para.4,Para.1,Scan the text and find the useful phrases and underline them in your book. 1.根据，按照 2.广为

9、接受的理论 3.以开始 4.一团尘埃 5.及时做某事 6.冷却 7.是的基础 8.允许某人干某事 9.连锁反应 10.用使充满,according to a widely accepted theory begin with a cloud of dust be in time to do sth. cool down be fundamental to do sth. allow sb. to do sth. a chain reaction fillwith,11.第一次 12.孵蛋，下蛋 13.超过 14.生产，繁衍 15.接着，轮到某人 16.照顾 17.阻止 18.由于的结果 19.

10、未来的百万年 20.取决于，依靠,for the first time lay eggs more than give birth to in ones turn look after preventfrom as a result of millions of years to come depend on,Read paragraph 2 to 5 carefully and finish the following form.,How life began on the earth,1. small plants in water,2. shellfish and all sorts o

11、f fish,3. green plants on land,4. insects(on land) 5. amphibians (on land and in water),6. forests,7. reptiles(on land) 8. dinosaurs(on land) 9. mammals(on land),10. small clever animals with hands and feet,11. human,Discuss the following questions,1.How did water come into being on the earth ? 2. W

12、hy water is important for the beginning of life? 3. Why were mammals different from other animals? 4. Why is it wrong in films and stories to show dinosaurs and people together? 5.Are people taking good care of the earth? What should we do?,1.How did water come into being on the earth ? The earth ex

13、ploded loudly with fire and rock. After the earth cooled down, water vapour turned into water.,2. Why water is important for the beginning of life? Because water allowed the earth to dissolve harmful gases into oceans and seas.,3. Why were mammals different from other animals? They were different be

14、cause they produced their young from within their bodies.,4. Why is it wrong in films and stories to show dinosaurs and people together?,Because dinosaurs died out long before human beings developed on the earth.,5.Are people taking good care of the earth? What should we do?,No.To solve this problem

15、, people should protect the earth carefully. They must stop putting too much carbon dioxide into the air ,reduce pollution,control the population and so on.,How many parts can it be divided into? Please find out the main idea of each part.,Part 1（Para_),How water came into being on the earth and its

16、 importance to the development of life.,1,Part 2（Para_),The development of living things,2-5,Try to translate difficult sentences in task in handout, then check the exercises.,Retelling,After the “Big Bang”, the earth was just a cloud of _ dust. It _ loudly with fire and rock, which were _to produce

17、 the water vapour, _ and other gases. Then small plants grew . They _and filled the oceans and seas with oxygen. Many millions of years later the first green plants began to _on land. When the plants grew into forests,_ appeared for the first time. They produced young generally by _eggs.,energetic,exploded,in time,multiplied,appear,reptiles,laying,carbon ,nitrogen,When dinosaurs disappeared, _ became more important. Now small clever animals with _appeared and _all over the world. As time went by they covered the earth and they are putting too much car