江苏省新沂市第二中学高三英语 专题复习 Unit 3 Science versus nature(第4课时)教案 牛津译林版必修5

Unit 3 Science versus nature课题 Unit 3 Science versus nature课型复习课教学目标把握考点，规范写作重点重点词汇，句型难点规范写作教法讲授法、讨论法、探究法教学过程教学内容个案调整教师主导活动学生主体活动Forth periodProject 1: Man versus natureFor a long time, our environment has been damaged because humans have beencareless. People have harmed nature through agriculture, fishing, huntingand tourism. We further damage Earth by building new channels in the seaand factories on the land, and by creating pollution with chemical waste.We will some day destroy the planet we live on if we continue in this way.However, if we focus only on conservation, then people may suffer. Noteverything that is best for nature is good for people. Would anyone saythat development should be stopped in favor of nature? From the point ofview of some people, we are only doing what humans have always done, usingnature to meet our own needs. Other people argue that such thinking maycause a catastrophe, unless we start to look around and understand howa clean environment benefits us all.After decades of destroying nature and using up natural resources, manydeveloped nations are now concerned about saving nature rather thandeveloping or destroying it. However, many poorer nations must focus onmeeting the everyday needs of their people. In doing so, they are usingup natural resources at a fast pace. They have not yet seen the effectsof the careless use of the environment like many wealthy nations have.Often they do not realize that the choices they make are bad for theenvironment. Should they be blamed for destroying hundreds of thousandsof acres of rainforest if it means a better income for their people? Thedeveloped and developing countries of the world need to work together tomake sure that people enjoy healthy and happy lives, without theenvironment around them suffering.It should not be a question of humans winning and nature losing. Humanscan only really win by protecting nature. After all, food has to beproduced in a healthy, natural system, and we all need clean air to breatheand pure water to drink. It is mankind's responsibility to find answersthat are good for everyone, and everything.Project 2: GM food: hope or danger?In recent years, there has been great progress in the study of genetics.With this progress, doors have been opened up to technologies that never existed before. While many people are excited about these new technologies, these same technologies frighten others. Nowhere is this truer than with genetically modified (GM) food.There are two ways in which a plant or an animal can be genetically modified. First, new material can be inserted into its DNA to give the plant or animal qualities which it would never have in nature. Second, material can be taken from the DNA of a plant or an animal in order to remove qualities which are not desired.One aim of GM research is to produce food which will make us healthier. So far, this technology has been used to produce plants which are better able to defend themselves against pests and disease. Supporters of GM food argue that GM plants are healthier and have larger harvests. While there has been research in GM animals such as pigs, no GM meat is being sold at present.Many questions have been raised about GM food. No one really knows whether it is safe for animals or humans to eat. Scientists admit that more tests should be done on GM food. Research has been limited to increasing production profits, rather than making sure that GM foods are safe. GM food could therefore be dangerous to eat.There is also a question as to whether GM plants are safe for the environment. Since GM crops are planted outside, they are part of the food chain—insects and other animals eat them or use their products, and these insects and animals will be eaten by yet other animals. No one knows what effects the GM material might have on the food chain.Since no one really knows whether GM food is safe, many countries have hesitated to give permission for the production of GM foods, as they would rather be cautious with this new technology.Step 1: Read and learn◆ Listen to the text and grasp the general spirit of the text Language focus:◆ 1. consider vt. 考虑；认为考虑；认为知识探究：I’m considering changing my job. 我在考虑还份工作。

We’re considering selling the house.我们正在考虑卖掉房子。

I consider what he said as reasonable. 我认为他说的有道理。

She considers it impolite to talk while eating. 她认为吃饭的时候说话是不礼貌的。

He was generally considered to have invented the first computer.人们普遍认为是他发明了第一台计算机。