《Science and nature》教案

约19850字。

M5 Unit3 Science versus nature
　　Period One Welcome to the unit
　　Teaching Aims:
　　Enable the students to know something about cloning, and give their own opinions about cloning.
　　Help the students learn how to describe the advantages and disadvantages of human cloning with the target language.
　　Teaching important and difficult points:
　　Talt cloning and human cloning.
　　How to describe the advantages and disadvantages of human cloning.
　　Teaching methods:
　　Discussion and task-based activities.
　　Teaching aids:
　　A tape recorder and the multimedia.
　　Teaching Procedures and ways
　　Step1. Lead-in
　　In the last unit, we learned something about the environment. Now our earth is faced with a lot of problems.
　　Q1: What are the problems?
　　Water pollution, air pollution, rubbish, deforestation, desertification, and sandstorm
　　Q2: Let’s have a competition. Please think that what we should do to protect our environment? The more ，the better. One measure is worth 10 points. Which group got the highest marks will get a present.
　　From these measures, we know that protecting the environment is everyone’s responsibility. And protecting the environment means protecting all the things on the earth, including plants, animals, human beings. But, some rare animals are dying out, such as rhinoceros, northeast tiger, white-flag dolphin and giant panda.
　　Q3: What should we do to protect them?
　　build nature reserve,  make laws to prohibit them from being hunted，                                         cloning，etc.
　　Asdents to read the title of the unit Science versus nature. Draw students’ attention to the word ‘versus’. Tell them that ‘versus’ is usually used when discussing sports competitions or the law, which means that two teams or sides are against each other.
　　Encourage students to think why ‘versus’ is used here. Asdents the following questions:
　　Do you think there is conflict between science and nature?
　　What might the conflict be?
　　In recent years, science is developing so fast that it is beyond our imagination. Cloning is one of the more advanced technologies.
　　Step2 Describing pictures.
　　Today, we are going to learn some information about cloning, now let’s enjoy some pictures.                                                                                                         
　　Picture1
　　Q1: Are you familiar with this picture?
　　Q2: What do you know about Dolly?  The world’s first cloned mammal.
　　Q3: Who created it?               Scottish scientists.
　　Q4: When was it created?           On 22nd February 1996
　　Q5: Is she still alive?     
　　No, she died in 2003 because of lung disease.
　　Dolly was world famous because she was exactly the same as her mother, in appearance and in genes. Now let’s look at the process of her birth.
　　First, we need three female sheep and take a kind of cell from the first sheep, then tat the center of the cell. And then take another kind of cell from the second sheep, and also tat the center of the cell, and then put the center of the cell taken from the first sheep into this kind of cell. And put this new cell into the third sheep, and then the cloned sheep Dolly was born. Do you understand?
　　Picture2
　　There are five little pigs. They are also the cloned animals. Their names are Noel, Angel, Star, Joy and Mary. They are all female. They were born on Christmas Day 2001. They are from Scotland.
　　Picture3
　　The cat is very beautiful and lovely, do you think so?
　　Q1: What’s the name of this cat?   Cc
　　Q2: where is its name from? Its name is from “copycat”
　　Scientist in the USA created it with a cell taken from its mother Rainbow. It was born in December 2002.
　　Picture4
　　The name of the cloned monkey is ANDi. It is from “inserted DNA” spelt backwards. It is the first genetically modified monkey. The technology is different from that used for Dolly. 
　　Step 3 Please fill in the blanks.
　　What Name Who/ where When Other information
　　sheep Dolly Scottish scientists 1996 The world’s first cloned mammal
　　Died in2003 because of lung disease.
　　pigs Noel, Angel, Star, Joy and Mary Scotland Christmas Day 2001 They are all female.
　　cat Cc USA Dec.2002 Its name is from “copycat”
　　monkey ANDi USA Jan,2000 It is from “inserted DNA” spelt backwards. It is the first genetically modified monkey.
　　Step4 Discussion
　　Q1: What do you know about cloning?
　　Cloning is a new technology, which produces from its own cells.
　　Cloning is a kind of biotechnology, which aims to produce exact copies of a single gene or other segments of DNA.
　　Q2: What other cloned animals do you know about?
　　Since the time Dolly was born, over 500 mammals, e.g., cows, cats, goats, mice, have been cloned successfully.
　　Q3: Do you thinld be a good idea to clone humans some day? Why or why not?
　　I don’t think it is a good idea to clone humans even though we might have the ability to do so in the future. From the ethical point of view, I believe the disadvantages of producing cloned animals outweigh the advantages. If not handled properly, great confusion could arise. Furthermore, if the technology is misused or stolen by evil people, great damage will be done. What if they cloned legions of criminals or murderers? The world would be turned upside down.
　　Step5 Language points
　　1. create ,discover ,invent ,find的区别
　　find 找到,发现,强调找到某物的结果,不强调过程.
　　discover 发现 发现的事物是本来存在但没人知道的
　　create 创造 创造新的事物
　　invent 发明 通过研究制造出从前没有的东西