Using LanguageⅡ教学设计(第二课时)

高二英语选修8 Unit2 Cloning-Reading教学设计 一. 教材分析

本课是人教版新教材选修8 Unit2 Cloning(Reading)，本课的中心话题是克隆。本文具体介绍了植物与动物克隆的区别、多丽羊的诞生与死亡及由此引发的争论。帮助学生进一步认识克隆的意义在于解决医学上的难题，为人类服务。本节课的目的旨在让学生读懂文章的意思、了解文章的内容、把握文章的中心，从而提升自己的阅读能力，要让学生学习了解克隆这门技术以及有关的争议，使学生了解克隆技术的优缺点，学会表达和支持个人观点，能用所学的有关Cloning的词汇去表述自己对这一新技术的观点和看法。

二.学情分析

高二年级的学生学习态度端正，学习兴趣浓厚，爱观察爱思考，乐于参与英语学习活动，且学生对克隆都有所了解，但阅读技巧的训练比较欠缺，而Unit2 Cloning又是一篇介绍克隆技术的说明文，专业性强，文中生词多，学生理解难度大。

总体来说学生的学习方式存在着差异，在教学上要做到分层次，教学方法有区别。

三．教学目标

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在认知、理解课文的基础上，学会自主学习。

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发展学生听、说、读、写的基本技能，提高阅读技巧，培养综合语言运用的能力；

3.

能利用上下文猜测词义，同时能根据上下文线索预测下文的发展；

4.

能根据所读材料运用适当语言进行简短的交流。

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通过本文激发学生勇于求知，探索科学奥秘的积极学习态度。使学生形成积极的情感态度，主动思维，大胆表述，提高语言实际运用能力，同时，又使他们陶冶情操、拓展视野，开发思维能力，发展个性，提高人文素养，形成正确的价值观和人生观。

四．重点与难点：

1.重点：（1）．了解科技说明文的文体特点并以此指导阅读；训练skimming, scanning,fast－reading,careful－reading等阅读技能； （2）．对文章深层次的理解及细节的欣赏，认识及了解克隆技术。

2．难点：(1).阅读技能的训练；

(2)．对科技说明文的鉴赏能力及事物的客观评价。 五．教学方法

Skimming, task-based method and debate method.

六．教学辅助工具：

（1）

录音机；

（2）多媒体

七。教学过程与方式

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Step I Revision and Lead-in

Revise some important and difficult words and phrases in the last period Show some pictures of Dolly the sheep(多莉羊)、A strawberry plant(草莓植物)、 Twins（双胞胎）、 Growing new plantson the screen. Get students to look at the pictures and discuss: which ones are natural clones and which ones are man – made? Then explain how they differ. S: I think the twins are natural clones and the Dolly sheep is man-made. T: You are right! Can you explain how they differ? S: The twins were born at the same time, but the Dolly sheep is man-made. T: Anything else? Who want to have a try? S: I think growing new plants is man-made. T: Good Job

【设计说明】克隆技术是一门前沿科技，学生对此兴趣浓厚，利用幻灯片展示当今克隆技术产生出来的动植物照片，学生的兴趣被瞬间激发，注意力高高度集中，学习的热情高涨。这就为进一步的学习做足了铺垫。

Step II Pre-reading Before class, ask the students to search for some information about this topic. Now show the questions on the screen, and then let them work in pairs and discuss about cloning. Ask the students to list the questions they want to find out and then share their lists with their partners.

Questions about cloning: 1. What is a clone? 2. How is a clone produced? 3. What benefits can humans gain from cloning? 4. What problems may arise when humans are cloned?

The teacher walk around the classroom and give some help if necessary. After a few minutes. T: Do you have other questions? Volunteer! S: I have! Should we clone human? T: Good job! I think many of you have questions, now let us read the article with the questions.

Suggest answers: 1. It is a way of making an exact copy of another animal and plant. 2. This happens in plants when gardeners take cuttings from growing plants to make new ones, and when small parts of a plant are taken and gown in a laboratory. It also happens in animals when twins identical in sex and

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appearance are produced from the same original egg. 3. It can help cure disease and can help couples who have no baby to bear a new baby. 4. There may be more bad people like Hitler. 5. In my opinion, I do not agree, for it may cause many moral problems.

【设计说明】Pre-reading是Reading的热身活动。它要求采用与同学讨论交流的方式谈论有关克隆的相关知识。设计一些令学生感兴趣又急于想知道的问题，不仅使学生增加了对克隆技术的了解，也为下一步的阅读打好基础。

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

1. Skimming

Ask students to read the text quickly and complete its main idea. The text is mainly about the 1. _________ of animal cloning and the life of Dolly the sheep, as well as the reasons why cloning is still 2. ____________. 【设计说明】让学生快速浏览课文，培养学生学会快速捕捉文章表层信息的能力，从而进一步理解文章的中心内容。

2. careful reading

(1).Ask students to

read through the passage and find the main idea of each paragraph. Para. 1 Cloning is a way of making an exact copy of another animal or 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. 【设计说明】此题要求学生与同桌讨论，然后请他们踊跃回答。使学生在合作和交流中开拓思维和创新能力。提高学生概括段落大意的能力。

(2). Ask students to read the text carefully and fill in the blanks.

Cloning is a way of _________(make) an exact copy of another animal.______ has two major uses. One is ________gardeners use it to produce commercial qualities of plants. The ________is that it is valuable for research on new plant species and for medical research on animals. _________, the process of cloning is difficult to undertake. The first successful clone, Dolly the sheep, made the whole________(science) world follow its process, though it had more______ (problem) than the normal sheep. On the other hand, Dolly’s appearance__________(raise) a storm of objections and had a great impact ______ the media and public imagination. Different people have different opinions of it. However, scientists still wonder whether cloning will help or harm us and ______ it is leading us.

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【设计说明】让学生仔细阅读，根据全文熟练掌握并且灵活运用本课学到的单词，词组实现自如表达语言的愿望。检查学生对全文内容的理解情况，把培养学生的阅读能力落实到每一节的课堂教学当中。

(3).Ask students to tell the following statements are true(T) or false(F). ① Cloning means making a copy of an animal or a plant. (

)

②Gardeners can make a lot of money by cloning plants. (

)

③ Cloning animals is as complicated as cloning plants. (

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④Dolly the sheep is the first successful clone of a mammal.

(

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⑤Natural clones happen in animals as well as in plants. (

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Suggest answers: ① F ② T ③ F ④T ⑤T2 【设计说明】通过判断正误题，有效的检查出学生的理解结果，而教师对错误答案的订正更有效地帮助学生理解课文。

Step Ⅳ Debate

Show the question about :Is cloning people a good thing or a bad thing ?on the screen. Ask students to discuss in groups and write down some statements showing their point of view. Pros: 1. 2. 3. 4. 5. Cons: 1. 2. 3. 4. 5. 【设计说明】让学生就以上话题展开讨论，借题发挥，训练学生的发散思维和语言表达能力。

StepV EXERCISE:Choose the best answer.

（1）. As for the cloning procedure of Dolly the sheep, all of the following are true EXCEPT ____.

A. the lamb is the clone of the donated cell from sheep B B. electricity is needed C. female sheep B provides an egg cell D. three female sheep are used （2）. From the

last paragraph we know that___. A. cloning will come to an end because of objections

B. cloned human beings will be produced C. many countries will use cloning in a wise way

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in the near future

D. all the research into human cloning will be forbidden 【设计说明】通过练习检查学生对课文内容的掌握情况。

Step VI Summary and homework

SUMMARIZE THE TEXT AND THEN Ask the students to do the following. 1.

Finish activities 2 and 3 on page12. 2.

Write a composition about the topic you have discussed. 【设计说明】总结使一节课有始有终，学生可跟着教师回顾和复习本节课的重点内容。

考虑到学生的个体差异，作业体现出层次性。

StepVII Blackboard design

Unit2 Cloning -Reading Key words : Differ，

twin ，clone, commercial, producer, undertake,

arbitrary,

object,

forbid,

accumulate,

cast down,

object to,

the media,

Key phrases:

In favour of，

（be）bound to（do）...,

from time to time,

bring back to life,

pay off,

in vain .

StepVIII Reflection after teaching

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