Unit4_Warming_up_and_reading_11精品课件.ppt

Venus?[vi?n?s]?? n. [天] 金星；维纳斯（爱与美的女神） Mercury??英?[m??kj?r?]??美?[m?kj?ri]?? n. 水星 Jupiter???英?[‘d?u?p?t?]??美?[’d??p?t?]??n. [天] 木星；朱庇特（罗马神话中的宙斯神） Saturn???英?[s?t(?)n]??美?[s?t?n]?? n. [天] 土星；农业之神（罗马神话中的一个形象） Uranus???英??美?[‘ju?r?n?s]??n. [天] 天王星 Neptune???英??美?[n?ptjun]?? n. [天] 海王星；海神 太阳系 地球大气 1. When did the “Big Bang” happen? It happened several billion years ago. Scanning Read the passage quickly and answer the questions. 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. Careful reading I. Read the passage carefully and match the main idea with each paragraph. Para. 1 The formation (形成) of the earth. Para. 2 The importance of water for life. Para. 3 A widely accepted theory about the formation of the universe. Para. 4 The arrival of humans and their impact影响 on the earth. Para. 5 The development of plants and animals on the earth. II. Answer the following questions. 1. Why was the earth different from other planets? Because the water remained on the earth. 2. Why did the p