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1、Unit 4 Astronomy: the science of the starsPeriod two Reading-HOW LIFE BEGAN ON THE EARTH教学目标：知识与技能： 1. Enable students to improve their reading and self-learning ability.2. Enable students to understand the formation of earth and the development of life on eartha情感态度与价值观：1. To enable Ss to realize t
2、he bad effect brought by human beings and concern about the future of life on the earth.2.Arouse students interest to search for the mystery of space.过程与方法：Teaching methods: skimming, scanning, discussing, group coorperation.Teaching procedures:课前自主学习：1. Important words and phrases重点词汇和短语Astronomy_,
3、atmosphere_,system_, violent_,solid_, Explode_, carbon_, dioxide_, oxygen_, surface_, Planet_ harmful_, development_, spread_, method_, solar system_, in time_, preventfrom_, depend on_2. 重点句子（在文章中找到这些句子，并翻译下面这些句子。）1. What it was to become was a mystery until the dust began to slowly combine into a
4、ball moving around the sun. P25_2.Its exploded loudly with fire and rock, which were in time to produce the water vapour, carbon dioxide, oxygen, nitrogen and other gases, which were to make the earths atmosphere. P25_3. It allowed the earth to dissolve harmful gases, which had become part of the ea
5、rths atmosphere, into the oceans and seas. P25_4. Whether life will continue on the earth for millions of years to come will depend on whether this problem can be solved. P26_Teaching procedure:Pre-reading: Think about these two questions1.Do you know the origin of life on earth?2.Each religion and
6、culture has its own ideas about how life began on earth. What do you knowFast reading:Task 1:1.Find out the main idea of this text: _2 Find out the main idea for each paragraph: Para.1 A. The importance of water for life Para.2 B. The formation of the earth Para.3 C.A theory about how the universe w
7、as formed Para.4 D.The arrival of humans and their effects on the earth Para.5 E. The development of plants and animalsCareful readingTask 2 Answer the questions with the given words or phrases.1. Why was the earth different from other planets? The earth still has ( ) 2. Why did the plants grow befo
8、re the animals came? Because plants provide ( ) for animals to breathe. 3. Why is it wrong in films and stories to show dinosaurs and people together? Because dinosaurs ( )long ( ) human beings developed on the earth.4. Why do you think that humans are the cleverest animals on the earth? They are th
9、e cleverest animals because they have ( ) than any other ( ) on the earth so far.5. What problem is caused by human beings? They cause ( ) . global warming larger brains oxygen before died out creature waterTask3:Choose the best answer according to the text1. Why was the earth different from other p
10、lanets? A. It produced a lot of heat. B. The water remained. C. The water disappeared. D. It was the oldest planet2. 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 th
11、e earth but not on other planets. D. The earth was not too hot and not too cold.3. Why was it necessary for plants togrow before animals? A. Animals needed plants to protect them from the sun. B. Plants provided oxygen for animals to breathe. C. Animals could hide from hunters in the forest. D. It w
12、as easier for plants to grow.4. It can be inferred from the text that _. A. after “Big Bang”, what the dust was to become remained a mystery B. plants appeared before the animals C. plants multiplied and filled the oceans with oxygen D. plants played an important part in the appearance of the animal
13、sTask4:Put the events into a timeline1. Insects and amphibians appeared. 2. Dinosaurs appeared3. The earth became a solid ball. 4. Small plants grew on the water5. 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
14、other fish appeared 10. The universe began with a “Big Bang”. 11. Clever animals with hands and feet appeared. 12. Mammals appearedTask5-Summary: Fill in the blanks with the proper words. Para.13 Before the life appearedAfter the _, the earth was a cloud of_. Later the dust began to _ into_. And the
15、n it _ loudly with fire and rock , which were in time to _ the water vapor , carbon dioxide, which were to make the earths _. As the earth _ down, _ began to _ on its surface. Water had _ from planets or satellites, but it _on the earth. That made it possible for life to begin to _ .combine exploded
16、 produce water develop stayed cooled a ball energetic dust appear atmosphere develop Big Bang Para 4-5 After the life appearedThe arrival of_ encouraged the_ of early _. Many millions of years later _ began to appear _. Later _ appeared. Some were_. Others called _,which were able to live on lands a
17、s well as _. When the plants grew into forests, _appeared for the first time. After they disappeared, _appeared on the earth. .They are different from all life forms because they _milk from their bodies. At last, _ appeared. humans small plants development land animals insects in the sea mammals she
18、llfish and all sorts of fish development produced on land dinosaurs the first green plants Task 6-Homework1: Translate these sentences into Chinese 1.What it was to become was uncertain until between 4.5 and 3.8 billion years ago when the dust settled into a solid globe.2.The earth became so violent that it was not clear whether the shape would last or not.3.It was not immediately obvious that water was to be fundamental to the development of life.Homework 2 :Suppose you were the earth, what would you advise humans to do? Write a letter to the human being.