必修 3 Unit 4 马林霞

Welcome to…

HOW LIFE BEGAN ON THE EARTH? What was there on the earth before life could begin? Why do scientists think there has never been life on the moon?

. Do you know each religion or culture has its own ideas about the beginning of the universe?

Stories about the beginning of the universe in China:

The Biblical Account “In the beginning God created the heavens and the earth. The earth was formless and empty, darkness was over the surface of the deep, and the spirit of God was hovering over the waters. And God said…” Day 1: God spoke and separated light from darkness creating Day and Night. Day 2: God spoke and separated the water creating sky and ocean.

Day 3: God spoke and created dry land. 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 and man. Day 7: God spoke rested and blessed this day calling Holy.

2.Do you know what a scientific idea is? The Big Bang The big bang theory suggests that the universe was once extremely compact( 紧密的 ) dense( 密集的 ), and hot. Some original event, a cosmic ( 宇宙的 )explosion called the big bang, occurred about 13.7 billion years ago, and the universe has been expanding ( 扩大的 )and cooling.

The Solar system Astronomy: the science of the stars

?HOW LIFE BEGAN ON THE EARTH Words and expressions: astronomy astronomer atmosphere surface solar system explode planet harmful oxygen exist global spread amphibian reptile shellfish mammal method prevent…from depend on

1. 1. Who is the first Chinese astronaut to go into space? ___________ What was the date when he circled the earth in space? A) November 15, 2003 B) October 15, 2003 C) September 17, 2004 D) December 17, Which country first sent people up to the space, the USA or the Soviet Union? So far, how many countries have succeed in sending people up to space? _______ Test your common knowledge: Yang liwei three

Reading  What is the main idea of the text? how life began on the earth. how life began on the earth. Topic sentences: 1. After the “ Big Bang ”, the earth was just a cloud of energetic dust. 2. What scientists think that the different because of the arrival of small plants growing in the water on its surface. 3. Many millions of years later the first green plants began to appear on land. 4. Small clever animals, now with hands and feet, appeared and spread all over the earth. dust plants animals

Read the 1st paragraph. 1) How did water come into being on the earth? The explosion of the earth produced water vapour, which turned into water when the earth cooled down. explosion (n.) --- explode (v.) water vapour (vapor) --- steam

2) What’s the significance of the presence of water on the earth? It allowed the earth to dissolve harmful gases into oceans and seas. significance --- significant (adj.) harmful --- harm (n.)/ (v.) do harm to

Can you put the order of development of life into a time line? Use the reading to help you. （ ） A insects and amphibians appear （ ） B a solid ball （ ） C reptiles appear （ ） D a cloud of dust （ ） E shellfish and other fish appear （ ） F dinosaurs appear （ ） G small plants grow on the water （ ） H plants begin to grow on dry land （ ） I presence of water （ ） J mammals (including humans) appear

3. Discussion: discuss the following questions and answer them 1) Why is it wrong in films and stories to show dinosaurs and people together? 1) Why is it wrong in films and stories to show dinosaurs and people together? 2) Why do you think that humans are the cleverest animals on the earth? 2) Why do you think that humans are the cleverest animals on the earth? 3) Is the earth getting warmer each year? If so, What effects will this have? 3) Is the earth getting warmer each year? If so, What effects will this have? How to solve this problem?

Suggested Answers: 1) Dinosaurs died out long before human beings developed on the earth. 2) Because they have larger brains than any other creatures on the earth so far. 3) Yes. If so, the earth will be so hot that no life will exist （存在） on the earth any more. To solve this problem, 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. back

Homework Find out the language points you don ’ t understand in the text.