UNIT 3研究生英语 教学 教程 课件.pptVIP

1. What do you think are the major environmental problems in the world? 2. What are the chief causes of these problems? 3. How can we solve the problems? 1. Environmental problems: pollutions of the air, water, soil etc.; global warming; ozone depletion; extinction of species; population explosion. 2. Each newly born person will add an additional burden to the supporting capacity of the earth, and thus is a challenge to other species. 3. we must have birth control. (Family Plan) Part I (Para. 1 – 7) Defining the nature of mankind, life, the planet and their relationship. Part II (Para. 8 – 18) Explaining the interrelationship between different life forms on the planet with the analogy of human body. Part III (Para. 19 – 20) Solution to the problem (i.e. birth control) and its necessity/significance. THE CASE AGAINST MAN case: suit or action in law 诉讼，案件，案例 What is the author’s main argument? How were ocean, atmosphere, and solid crust formed in the process of evolution? In what way did they interact with each other? What were the noticeable results of their interaction? What happened to portions of water between 2 billion and 3 billion years ago? In what sense is life an inseparable part of the structure of the earth? What analogy is used to explain that the entire planet, plus, solar energy, is one enormous intricately interrelated system? How does the author explain the evolution of the Earth? （Page 69 B-2) 1） It has been nearly 5 billion years since the Earth assumed approximately its present form. 2）Ocean, atmosphere and solid crust were formed by the gradual outward… 3）Between 2 billion and 3 billion years ago, portions of the surface water, bathed by the energetic radiation from the Sun, developed what we call “life”. 4）The entire planet is a life form made up of nonliving portions and a large variety of living portions. How are the 50 trillion cells in a human body interrelated and interdependent? How many types of cells are grouped here? Wha