人教版高中英语必修三第四单元课件PPTword版本.ppt

Module III Unit 4Astronomy;I. Warming up;I. Warming up;Scientists now think Pluto is too small to be called a planet ;The names of eight planets;海王星 Neptune;In this unit, we’ll learn something more scientific;Pangu separates the sky from the earth; Nvwa made humans;Read the passage quickly and answer the questions; Phrases and Useful Expressions;1. When did the “Big Bang” happen? It happened several billion years ago.;2. What form was the earth after the “Big Bang”? The earth was still just a cloud of dust. 3. What made up the earth’s atmosphere after the earth exploded? Carbon, nitrogen, water vapour and other gases.;4. How did water come into being on the earth? As the earth cooled down after it exploded, water came into being.;5. What’s the significance of the presence of water on the earth? It allowed the earth to dissolve harmful gases and acids into the oceans and seas.;6. What was important to the development of fish? oxygen. 7. What made possible the rise of mammals on the earth? The disappearance of dinosaurs made the possible the rise of mammals on the earth. ;8. Why are mammals different from all life forms in the past? They gave birth to young baby animals and produced milk to feed them. ;;Para. 1 A.The formation (形成) of the earth. Para. 2 B.The importance of water for life. Para. 3 C.A widely accepted theory about the formation of the universe. Para. 4 D.The arrival of humans and their impact on the earth. Para. 5 E.The development of plants and animals on the earth.; True (T) or False (F). 1. The earth 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.; Summary;