Unit Four 第四单元 Central Topic of the Unit Nature and the Population Growth I. Teaching Objectives Students are expected to learn to be able to: 1. Listen and talk on nature and the population growth, which determined mankind’s future. Please find and tell how they will influence our future. 2. Grasp the main idea of the text by overcoming the language difficulties as well as problems with technical terms3. Learn to grasp the writing skills of Graph Writing4. Learn how to Translate Passive Sentences from English into Chinese 5. Master the Structure and Function points: Patterns to express comparison, comparative and superlative degree 6. Do extensive reading practice by using Text B and Text C7. Learn to expand students’ skills on listening and talking abilities by using the materials in the funny story retelling and for recitation.. 8. Study More on the Topic of the Unit by Surfing the Internet II. Lesson procedure and time allotment Period 1-2Period 24Period 5Period 6 Part One: Listen and TalkPart Five: Learn to speak with your partnerFocus readingText AWriting Guide Translation Guide Text B Text C Fast-reading Skills Expansion Structure and FunctionIII. Key Points for Students’ Comprehension, Repetition and Sound Mastery of the Unit 1. Key words and phrases: migration n. cluster n. jeopardize v. ecological adj. , ecosystem n. , parlance n. alarming adj. alarmingly adv. habitat n. livelihood n. fragile a. exploitation n. sustainable adj. sustainability n. inherent adj. equity n. consequence n. emission n. amplify v. alleviate v. alleviation n. prosper v catchphrase n. puddle n. stake n. emerge v. contentious adj. undertake v. generate v. notorious adj. lax adj. regime n. chorus n. foster n.2. phrases and expressions :in addition to , in common parlance , so-called , account for , address the consequence , fizzle out 3. Stressed words and phrases: consequence, alarm 4. Synonyms discrimination: equity, equality, equivalent; finite, limited, restricted; reduce, deplete, drop 5. Important structure items: Patterns to express comparison, comparative and superlative degree 6. Writing Guide: How to Do Graph Writing 7. Translation Guide: Ways to Translate Passive Sentences from English into Chinese8. Learn to expand students’ skills on listening and speaking abilities by using the materials provided in Part V. Text A Suggested Background Information & Introductory Remark to the Focus Reading The end of world population growthThere has been enormous concern about the consequences of human population growth for the environment and for social and economic development. But this growth is likely to come to an end in the foreseeable future. Improving on earlier methods of probabilistic forecasting1, here we show that there is around an 85 per cent chance that the world's population will stop growing before the end of the century. There is a 60 per cent probability that the world's population will not exceed 10 billion people before 2100, and around a 15 per cent probability that the world's population at the end of the century will be lower than it is today. For different regions, the date and size of the peak population will vary considerably.IV. Reference Material to the Words and Expressions in the Texts New Words 1. migration n. 移民，迁徙，移动 Scientists have studied the migration of fish over long distances.科学家研究过鱼类远距离迁游的现象。
There was a huge migration of people into Europe because of the war.因为战争，大量的移民涌入欧洲2． migrate v. 迁移，迁徙，转移 In winter many of our birds migrate form here to warmer countries.我们有许多鸟儿冬天从这里迁移到比较温暖的国家去In some developing countries more and more people migrate to urban area.在某些发展中的国家，越来越多的人向市区迁移3. cluster n. (人、动物等的)群，组 v. 聚集 There was a little cluster of admirers around the actress. 女演员周围拥着一小群崇拜者The mountain-climbers clustered together for warmth. 登山者聚集取暖 The square was clustered with people. 广场上聚集着成群的人。
Most of the foreign embassies are clustered in this area. 大多数的外国使馆都聚集在这一区4．jeopardize v. 危害，使受危困 If you are rude to the boss, it may jeopardize your chance of success.如果你对老板没有礼貌，那也许会危及你事业的成功Isn't it possible that something could happen there that would jeopardize the fundamental interests of Hong Kong itself ?难道香港就不会出现损害香港根本利益的事情?Sociologists are greatly concerned whether the foreign cultural acquisition will jeopardize Chinese cultural norms and values 外国文化输入是否会对我国的文化准则和价值观念产生不良影响, 社会学家对于这一点非常关切。
5. ecological adj.. 生态的, 生态学的 an ecological disaster 生态灾难 a group of interacting organisms that live in a particular habitat and form an ecological community.生活在特定栖息地并且形成一生态群落，生物之间又相互影响，这就叫做生物群落Great achievements were made in the ecological construction and rehabilitation. The ec。