Unit 2 Cloning 第3课时 导学案-人教选修8精品

Unit 2 Cloning 第3课时导学案Teaching aim: 掌握科普文章的阅读方法及策略
Teaching key points and difficulty
Help students analyze the reading technique of the article.
学习过程：
New words: 预习下列单词，并会默写
1.精确的
2.商业的
3.坦率的
4.着手，承担
5.突破
6.程序，步骤
7.携带者
8.总共
9.任意的
10.修改，改正
11.反对
12.媒介
13.获得，赢得
14.获得，到达
15.道德的
16.保守的，守旧的
17. 禁止
18.积累
Step 1: Find out the main idea of each paragraph.
Para 1.
Para 2.
Para 3.
Para 4.
Para 5.
(a)Cloning has two major uses.
(d)The problems of Dolly.
(b)The effect of Dolly.
(c)It is forbidden to clone human beings.
(e)Cloning is a way of making an exact copy of another animal and plant.
Step 2: Read the passage quickly and finish the following comprehensive exercises. Choose the right answer according to the text.
1. Dolly the sheep_____.
A. looked exactly like the sheep that provides the egg.
B. was the exact copy of the sheep that provides the nucleus.
C. looked like the sheep that gave birth to it.
D. had the characteristics of all three sheep.
2. It can be inferred from the passage that a cloned animal_____.
A. usually lives as long as the original one
B. usually lives longer than the original one
C. usually lives longer than the original one
D. is usually as healthy as the original one
3. Which of the following is not an advantage of cloning？
A. Cloning can be used for medical purposes.
B. Large quantities of food can be produced by cloning.
C. Cloning can help keep animals from becoming extinct.
D. Famous persons who have passed away can be cloned.
4. We can use the skill of cloning to __________.
A. bring about global peace
B. create other famous scientists
C. improve the development of learning language
D. cure some special diseases
5. What are people cloning now ？__________
A. They are cloning trees，crops as well as animals
B. They are cloning books and machines
C. They are cloning humans and animals
D. They are cloning plants and science
Step 3: Detail reading
Fill in the chart using the information from the text.
(1)Problems or dangers of cloning:
A) Animals may_____ ________ _______ of older animals.
b) Animal clones may _____ _______ than the donor animals
c) ______ _____ may want to clone themselves.
d) There are _________ __________ to cloning human beings.
(2) Advantages of cloning
a)Medical cloning could _______ ______ for serious degenerative(变质的)________ in humans.
b) Cloning plants can ______ _______ of similar _______
_______ ________.
c) Cloning plants can be _____________ for research on new ________ ________.
d) Cloning can help save ___________ _________
Ⅰ.课文词汇等填空(旨在复习本课文中的单词拼写和主要词语等)
根据课文内容完成下面语法填空，注意单词拼写和词语用法：
Cloning is a way of _____1_____ (make) an exact copy of another animal or plant. Cloning has two ___2____(主要的) uses. Firstly，gardeners use it to produce plants. Secondly，it is ____3_____(value) for medical research on animals. Cloning plants is straightforward but the cloning of animals is more____4______(复杂的). The procedure is difficult to ____5_____(开展). In 1996，scientists succeeded in ___6_____(clone)Dolly the sheep. Then came the disturbing news that Dolly was ill. _____7______ Dolly lived for six years，Dolly’s appearance raised a storm of _____8_____(object). Government became nervous and many ______9______(禁止) research into human cloning. Scientists still ____10______ whether cloning will help or harm us and where it is leading us.
家庭作业(独立完成后再看参考答案)
课文佳句背诵与仿写(旨在培养对难句的理解和写作能力)
1.【原句】The fact that she seemed to develop normally was very encouraging.
多莉看来是在正常地成长着，这很令人鼓舞。

[模仿要点] 句子结构：同位语从句
【模仿1】学校取消体育运动的想法非常令人丧气，依我的观点，这并不能防止学生受伤。

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【模仿2】谚语“诚为上策”是众所周知的，它说明了诚实的重要性。

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2．【原句】The advantage is that if there is a new illness some of these animals my die，but others will survive and pass on the ability to resist that disease to the next generation. 其优点是，如果发生了某种新的疾病，这类动物可能会死去，而另外一些却能存活下来，并且把这种抗疫力传给下一代。

[模仿要点] 句子结构：表语从句+条件句，
【模仿1】网上购物的弊端是，如果你在网上买了质量差的商品，你不可能会换的了；但你可以在真正的商店里精挑细选。

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【模仿2】早起的优势是，如果我们早起，我们将有机会享受清新的空气和早晨的宁静，但并不是每个人都认为这是令人遗憾的事情。

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3. 【原句】Based on what we know now，you cannot clone animals that have been extinct longer than 10，000 years. 就我们现在所知，你不可能克隆那些绝种了一万年以上的动物。

[模仿要点] 句子结构：V-ed + what引导的宾语从句，+主句+定语从句
【模仿1】根据调查所示，我们可以更好地理解我们对大自然所做的一切。

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【模仿2】根据我们所读到的，我们可以得出结论是人类该对环境污染负责。

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1.【模仿1】答案：The idea that schools cancel sport activities is very discouraging，which，in my opinion，is not a good way to prevent students from getting hurt.
【模仿2】答案：The old saying that honesty is the best policy is well known to everyone，which signifies the importance of honesty.
2. 【模仿1】答案：The disadvantage of shopping on line is that if you bought a poorly made goods on the Internet，it is impossible for you to change it，but you can have a careful look at the goods in a real shop and choose the best one.
【模仿2】答案：The advantage of getting up early is that if we get up early，we will have the opportunity of enjoying the fresh air and calmness of the morning，but not everybody think it a regrettable thing.
3. 【模仿1】答案：Based on what was shown on the survey，we can make a better understanding about the thing that we have done to nature.
【模仿2】答案：Based on what we’ve read ，we can make a conclusion that it is human beings that are to blame for the pollution of the environment.。