读书不知味，不如束高阁；蠢鱼尔何如，终日食糟粕。下面是课件范文网小编为您推荐高二下册英语复习资料： science and nature。
1. think more ab out the relationship between science and nature.
2. describe some items and atmosphere with scien tific terms.
3. express their opinions on cloned animals and humans as well.
4. develop an interest in doing more reading and research on the topic.
教学难点 Practical usage
教具 Blackboard ， slides and handouts
Step 1 Lead in （PPT 4-7）
Play a dialogue about height-increasing operations and ask students to fill in the blanks. After checking the answers， allow some time for students to freely express their opinions on height-increasing operations， thus introduce the major topic “science versus nature”。
Step 2 Science versus nature （PPT 8）
1. Explain the word “versus” （ Two sides are against each other）
2. Brainstorming. Ask students to think of other cases in which science goes against nature? The teacher can introduce some new vocabulary like GM food and plastic surgery which might be useful in later teaching. Show some pictures to help them better understand these things.
Suggested answers: GM food， cloning， dams， artificial rainfall， organ transplant， air-conditioner， cloud seeding， plastic surgery， euthanasia， etc.
3. Allow students some time to have a light discussion on advantages and disadvantages of any of the above cases.
4. In terms of science versus nature， what do you think the relationship between science and nature should be like?
（Both advance in harmony）
Step 3 Cloning （PPT 9-11）
1. Display pictures of Dolly and normal sheep on the screen. Tell them Dolly is a cloned sheep. But it looks no different from normal sheep. Show more pictures of cloned animals （ cloned calves， pigs， monkey and mule）. Their names can be introduced here， which might arouse students’ more interest.
2. Introduce the concept of “copy”. Ask the students to think about this question: Are cloned animals exactly the same as the “mother animals”?
（They may have the same appearance but their physical qualities can be very different. Many cloned animals died at a much younger age than average.）
3. Interview one student about his feeling towards cloned animals by asking the following three questions:
1） If you happen to have a cloned cat， how would you feel? （excited）
2） What if another cat with the same appearance comes to you? （surprised and more excited）
3） What if more cats with the same appearance come to you? （shoc ked and scared）xkb1.com
4. Interview another student about his feeling towards a “cloned him”. Then ask the other students if they would like to see a “cloned him” and why.
5. Girls versus boys. Ask students to have a 2-minute debate on whether it would be a good idea to clone humans some day.
Step 4 Summary （PPT 12）
Give a brief summary of their debate. Point out any possible problems in their debate like the lack of ideas and supporting points. Tell students that you will read m ore about cloning in the following period and will have a further discussion.