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课件网) Unit 4 Astronomy: the science of the stars Twinkle, twinkle, little star, How I wonder what you are. Up above the world so high, Like a diamond in the sky. Twinkle, twinkle, little star, How I wonder what you are. Mercury 水星 Venus 金星 Earth 地球 Mars 火星 Jupiter木星 Saturn 土星 Uranus 天王星 Neptune 海王星 universe Which planet are you living now? How did life begin on the earth? How life began on the earth Reading Task1 Skimming Read the text quickly and choose the main idea of each paragraph (七选五)(4mins) A. How life began on the earth B. The formation of the earth. C. The arrival of the humans and their influence on the earth. D. The development of plants and animals on the earth. E. A widely accepted theory about the formation of the universe. F. The disappearance of the dinosaurs. G. The importance of water for life. Para 1 Para 2 Para 3 Para 4 Para 5 Let’s get to know how life began on the earth Careful-reading For several billion years after the “Big Bang” A ( ) Between 4.5 and 3.8 billion years ago A ( ) globe ( ) with fire and rock Produce????(_____ ) (C, N2, H2O, and other gases) made atmosphere cool down and_____ appeared Life began on the earth cloud of dust solid Exploded water Task 2. Read paragraph 1-3 , and find out the formation of life on the earth Task 3. Read paragraph 4 and 5 quickly,and find out how life develop? small plants on the_____ early _____ plants grow on _____ _____ appeared on land amphibians(两栖动物) plants grow into _____ reptiles dinosaurs manmals water shellfish land insects forests lay eggs give birth to young baby animals Life develop on the earth What is writing style of the passage? A. an essay(散文) B. an exposition(说明文) C. a narrative(记叙文) D. a novel(小说) Thinking The passage develops in the order（顺序） of _____ time In the last paragraph, what is the writer's attitude towards the future of the earth? A. positive (积极的) B. negative(消极的) C. neutral(中立的) D. indifferent(漠不关心) Thinking Post-reading At first, the earth was 1.___ cloud of dust ,which later settled into a solid globe. Then, water appeared on the earth. Many millions years 2.___(late) , small plants grew on water. They 3. ___(multiply) and filled the seas with Oxygen, 4.___encouraged the 5.___(develop) of early shellfish. Next, green plants grew on land. When they grew into 6.___(forest), reptiles appeared for the first time. They 7.___(general) produced young by 8.___(lay) eggs. After dinosaurs disappeared, manmals came. At last, humans appeared and spread all over the world. 9.___ they are putting too much Carbon Dioxide into the air. Whether life will continue depend on whether it can 10.___(solve). How life began (3 mins) Post-reading At first, the earth was 1.___ cloud of dust ,which later settled into a solid globe. Then, water appeared on the earth. Many millions years 2., ___(late) , small plants grew on water. They 3.___ (multiply) and filled ... ...
