高中英语必修三第四单元课件.ppt

solar energy plant trees recycle rubbish prevent desertification save water purify air What can we do to take care of the earth? 2021/3/14 * Whether life will continue on the earth depends on human beings. 2021/3/14 * 精讲点拨 The earth became so violent that it was not clear whether the shape would last or not. What many scientists believe is that the continued presence of water allowed the earth to dissolve harmful gases and acids into the oceans . 分析句子: Homework 1. A composition about What we can do to take care of the earth? 2. Read and retell the passage to learn the important and difficult language points. * * 地球是人类的家园，也是太阳系中一颗普通的行星，半径约6400千米 * * 日地平均距离 = 1天文单位 = 1.496×1013 厘米 2021/3/14 * Unit 4 Astronomy: the science of the stars How much do you know about the universe? What are the names of the eight planets that circle our sun? What is their order from the sun? 地球 ______ 木星 ______ 火星 ______ 水星 ________ 海王星 _______ 土星 ________ 天王星 _______ 金星 ________ Earth Jupiter Mars Mercury Neptune Saturn Uranus Venus THE SOLAR SYSTEM 1. How old is the universe? 2. How old is the earth? 3. Which were the first creature or plants on earth? 4. Do you know what the order for the development of plants and animals is? Several billion years ago. Between 4.5 and 3.8 billion years ago. Very small air-breathing creatures. Free Talk 2021/3/14 * Ideas about how life began 2021/3/14 * reading How Life Began on the Earth Fast reading Read the passage quickly and find the main idea. A brief introduction on how the universe developed and how life began on the earth. Careful reading Para 1: Para 2: Para 3: Para 4: Para 5: A widely accepted theory about the formation of the universe. The formation of the earth. The importance of water for life. The development of plants and animals on the earth. The arrival of humans and their impact on the earth. Read the passage carefully and analyse its structure. earth, atmosphere and water life development human beings 1. Wha