高二英語教案：《Unit 2 Cloning. 克隆》教學(xué)設(shè)計（二）(3)

　　Step III While- reading

　　Get the students to comprehend the passage quickly and accurately and meanwhile help the students form a good habit of reading.

　　T: Have you not the answers of your questions? Now please skim the passage fast to obtain a general understanding of the whole passage into several parts and find out the main idea of each part.

　　Show the following.

　　Para. 1 Cloning is a way of making an exact copy of another animal and plant.

　　Para. 2 Cloning has two major uses.

　　Para. 3 The problems of Dolly.

　　Para. 4 The effect of Dolly.

　　Para. 5 It is forbidden to clone human being.

　　Step IV Post-reading

　　Ask the students to read the passage again to finish three tasks.

　　T: Now let’s listen to the. While listening, pay more attention to the correct pronunciation and tone. Then read the text by yourselves to get the answers to the three tasks. You can work in groups.

　　T: First, What are the problems or dangers of cloning?

　　S: Let me have a try! First, the cloned animals have the same illness of old animals and the same goes with the other species. Second, the cloned animals have short life and can cause moral questions.

　　T: You are right! And what are the advantages of cloning?

　　S: I know! Firstly, gardeners use it all the time to produce commercial quantities of plants.

　　Secondly, it is valuable for research on new plant species and for medical research on animals. Thirdly, it suddenly opens everyone’s eyes to the possibility of using cloning to cure serious illnesses, and even producing human beings.

　　T: What is the writer’s opinion? What do you think is the writer’s point of view in this reading passage? Is it in favour of cloning or against is?

　　S1: I think the writer is in favour of it, because there are many advantages of cloning. It can help people solve many problems in our daily life.

　　S2: I think the writer doesn’t agree with it, because if the cloning technology can be used in an evil way, it can cause much trouble to our society.

　　T: The next question: What is your opinion of cloning? Give the reasons.

　　S1: As a coin has two sides, everything has two aspects. First, if the cloning is used in a correct way it can bring many conveniences to us. Such as: curing serious illnesses and being used to produce commercial qualities of plants. On the other hand, if the cloning is used in an evil way it can cause much troubles: such as moral questions.

　　S2: My view on cloning and nuclear transfer is that it is ethical. So actually I find no reason to clone presently. I have this opinion currently, because scientists are unable to successfully clone using nuclear transfer as of today.

　　S3: I also have a problem with the possible effects of using nuclear transfer on a large scale. This is because I fear that cloning could greatly reduce genetic diversity. I believe if we were to interfere with the genetic diversity of an entire population we would undoubtedly fail.

　　S4: As you can see I believe cloning using nuclear transfer should not be used on humans for any reason. I think if we were to use cloning it should be closely monitored as to what dangers are involved in having copies of people. I also think this technology should not be used until success.

　　S5: I agree that we should develop cloning. I’m not afraid of cloning Hitlers or excited to clone Einsteins. I would say the time and the environment produced Hitler, not his DNA. So you do not need DNA from Hitler to produce a Hitler. In fact, there are Nazis already present. We should make use of cloning to benefit future generations. You can imagine that how happy the people are if they can recover from the serious illness or get back the son who has just lost his life in an accident by cloning.

　　T: Good job! Yes, if we our human beings use the scientific technology properly it can bring many advantages to us!

　　S: Why did Dolly’s appearance raise a storm of objections and have a great impact on the media and public imagination?