新人教必修三Unit4Astronomy-Reading[课件]VIP免费

ReadingHOW LIFE BEGAN ON THE EARTHWarming upWhat are the names of the eight planets that circle our sun?海王星 Saturn 水星Uranus 金星Venus 地球Earth 火星Mars 木星Mercury 土星Jupiter 天王星Neptune A Quiz Game 1. How old is the earth? A. About 3.5 billion years B. About 4.5 billion years C. About 5.5 billion years D. About 6.5 billion years 2. ______ of the earth surface is covered by water. A. 20% B. 30% C. 50% D. 70%3. How many planets are there in the Solar System? A. 6 B. 7 C. 8 D. 9 4. What is the total population of humans on the earth? A. About 3.5 billion B. About 4.5 billion C. About 5.5 billion D. About 6.5 billion5. How long does the rotation ( 自转 ) of the earth take? A. 12 hours B. 24 hours C. a month D. 365 days6. Which continent is the smallest? A. Africa B. North America C. South America D. Oceania 7. On what day is the Earth day celebrated? A. April 22 B. May 4 C. August 21 D. November 118. Which ocean is the largest? A. The Pacific Ocean B. The Arctic Ocean C. The Indian Ocean D. The Atlantic Ocean9. Which country has the largest area? A. Canada B. China C. Russia D. U.S.APrediction Look at the picture. Do you know the topic of this unit?海洋里的细胞开始分裂 登陆登陆爬行动物恐龙恐龙Mammals人类的兴起 Do you know what it was like before life appeared on earth?可以演化成低级生命的小液滴水泡状的太空原始生命体It was full of water.1. What do we mean when we say we are studying a subject scientifically? Or what’s the correct attitude towards science? We should be objective, not superstitious.2. What’s the correct way to prove a scientific idea? We should design experiments to test it for several times. Then we can analyze the results and draw a conclusion at l...