M5Unit3Welcome.doc

M5 Unit3 Welcome to the unitTeaching goals 教学目标1. Enable the students to know something about cloning, and give their own opinions about cloning.2. Help the students learn how to describe the advantages and disadvantages of human cloning with the target language. Teaching important points教学重点Talk about cloning and human cloning. Teaching difficult points 教学难点How to describe the advantages and disadvantages of human cloning. Teaching methods教学方法Discussion and speaking. Teaching procedures and ways教学过程与方式Step I Lead-inWalk into the classroom with a sad face. T: Good morning, class.Ss: Good morning, Miss Wang. T: How are you today?S: Fine. But you look so upset, what happened?T: My pet cat died of some unknown disease this morning, which makes me so sad. You know I love her so much that I nearly cant live without her. However, nothing can take her place in my mind, what can I do?S: Why dont you have one that is exactly the same as yours by cloning? I think its the only way to solve your problem. T：Whats clone?S1: A clone is a copy.S2: Cloning is one of the most popular technologies in the 20th century. T：What other technologies do we have in recent years?S1: Maybe the most influential technology is computer science, which has contributed a lot to our society in many fields. Now, for most of us, we cant live without computers.S2: Every coin has two sides, while we benefit a lot from computer technology, it does do harm to us in some degree. For example, many people get computer disease, and some students give up schooling because of being addicted to computer games.S3: Air-conditioner is widely used today. We can spend both winter and summer without worrying about being too cold or too hot because we can control the temperature ourselves. But as a result, our environment is polluted at the same time; our planet is becoming warmer and warmer, which partly results from our using of air-conditioners.T: You are right. Just now you mentioned cloning. Now lets see some pictures.Show the pictures on the textbook on the screen.Step II Welcome to the unitT: Here are six pictures. They are all clones. Maybe all of you are familiar with Dolly, arent you?Ss: Yeah.T: Where and when was Dolly born? Is she still alive? Who can give us some information about Dolly?S: Dolly the sheep was born on February 24, 1997 in Edinburgh Scotland. She was cloned from a cell of another sheep. Dolly died in February, 2003, after developing a progressive lung disease.T: Do you know other cloned animals?S: A cloned frog first appeared in the world in 1952. In 1962, a tadpole was successfully cloned. Whats more, it was announced that human embryo was successfully cloned in a company in America on November 25th, 2001.T: Now suppose youve grasped cloning technology, what would you like to clone? Why? S1: Id like to clone dinosaurs, which disappeared several billion years ago. Because I want to reappear the prosperity in dinosaurs times and let our future generation have the opportunity to see the giant animals.S2: I dont like to clone animals in ancient times because I think it means nothing. I want to clone water. As we all know, water is very important to our planet and even the whole universe. However, with the development of our society, the amount of water cannot satisfy our needs. Besides, in some areas in the world, people even havent enough water to drink.S3: I agree with S2 that water is of great importance to us. But in my opinion, food is more important. If we can successfully clone food, we can save people in South Africa who are suffering from hunger; it will be of great benefit to the world.S4: Its a fact that our living environment is becoming worse and worse, so its our responsibility to protect the environment around us. Therefore, I would like to clone the tropic rainforest in Amazon. I will place it in Sahara to purify the environment and Im sure that would be wonderful.S5: The human organ would be my choice. Every year, a large number of people in the world die from lack of human organs to replace their sick ones. And my grandfather is an example. S6: I would prefer to clone a luxurious villa, a most perfect car and a lot of money to enjoy myself! To live a luxurious life as a millionaire has been my dream for a long time.T: All of you have good wishes! Science is developing so fast that it is even beyond our imagination. Cloning is one of the more advanced technologies! Everything on earth is unique, but cloning makes it possible to have a double. Do you know why were different from each other?Ss: .T: Its because of genes. Genes are the instructions for life. They make each individual plant or animal different and unique. Do you think it would be a good idea to clone humans someday?S: I dont think it would be a good idea to clone humans because the earth we are living on is already overpopulated, and cloning humans would make the situation worse. S: I dont quite agree. I think it would be fun to clone humans. If you have a cloned sister or brother, you wont feel lonely anymore. Whats more, for those couples who cant have a baby, cloning would help them have their own babies. Step III DiscussionDeal with the questions in activity F.T: Now work in pairs and discuss the questions in activity F.Several minutes later, ask some pairs to demonstrate their conversations. A sample conversation: A: If we use cloning technology, there wont be any idiot in the world and, as a result the human society will be improved.B: I dont agree. If persons like Hitler (希特勒) were cloned they would bring troubles to our society. A: Using cloned organs, we can save the lives that are dying of incurable diseases, such as cancer and AIDS.B: But there will be population problem. You know our earth is overpopulated now. If we clone humans, there will be more and more people and the earth will run out of resources. I think human being is against nature law. If we stick to the opinion that human cloning is right, well be punished by nature in the future. A: Police would have difficulty in arresting the criminals because of clones. So I think governments should pass laws to make human cloning illegal.B: I agree. Our moral principles will be destroyed. What if someone has two fathers? Or two wives?A: Even if the par