1、选修八 Unit2 CloningPeriod1 ReadingTeaching aims（教学目的）Knowledge aims:1. Get students to learn the useful new words and expressions in this part: clone, commercial, producer, undertake, arbitrary, object, forbid, accumulate, cast down, object to, the media, in favour of, etc.2. Let students learn about
2、cloning Ability aims:1. Develop students reading ability and let them learn different reading skills.2. Enable students to talk about cloning Emotional aims1. Help the Ss know about cloning.2. Develop students sense of cooperative learning.Teaching emphasis（教学重点）1. Let students learn more about clon
3、ing.2. Get students to learn different reading skills,especially the reading ability of understanding implied meaning of the authors.Teaching difficulties（教学难点）1. Develop students different reading abilities.2. Enable students to talk about cloning Teaching &learning procedures (教学与学习过程)Step1. Prepa
4、ring lessons &self-study and exploring the problems (预习自学，探究问题)Task1. Warming upAsk the Ss to talk about the following questions: 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?5. Should we clone human?6.
5、Could cloning replace sex as the means of creating new human life?7. Could a parent clone a child who is dying of a terminal illness?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 n
6、ew 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 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 peo
7、ple like Hitler.5. In my opinion, I do not agree, for it may cause many moral problems.6. No. Because cloned human has the same quality as the real human, natural born babys quality is higher than his parents. 7. No. The cloned baby also has the disease.Step2.Finishing plan & asking questions（完成学案，提
8、出问题）Taks2. Read the short passages at Page 11-12 and choose one from A,B,C and D for each exercise in the following. 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.
9、 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
10、 usually as healthy as the original one3. 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 clo
11、ned. 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 an
12、d machines C. They are cloning humans and animals D. They are cloning plants and science (Answers:1-4 BCDDA)Step3.Researching cooperatively& answering questions(合作探究, 解决问题)Task3. Intensive reading (7ms )Read the passage again, then try to find the main idea of each paragraph.1.Cloning is _ 2.Cloning
13、 has _ uses.3.The _ of Dolly.4. The _ of Dolly.5. It is _ to clone human beings. Suggested answers:1. a way of making an exact copy of another animal and plant.2. two major3. problems4. effect5. forbiddenStep4.Summing &chewing, summarizing knowledge（总结反刍 ，知识梳理）Task4. Get the students to find the fol
14、lowing sentences in the passage and learn the usages of them.1Then came the disturbing news that Dolly had become seriously ill.之后传来了多莉得了重病的令人烦恼的消息。(1)表示方位、时间或方式的副词或介词短语，如here, there, now, then, up, down, in, away, off, out, in the room, on the wall等置于句首时，句子倒装。Look, here comes the bus.看，公共汽车来了。Out r
15、ushed the children.孩子们冲了出去。There goes the bell.铃响了。(2)本句中的news与that Dolly had become seriously ill是同位语关系。一个名词或代词后面有时可接一个单词、短语或从句，对前者做进一步的解释，说明它指的是谁或是什么，这就是同位语。We heard of the news that our team had won.我们听说了我们队赢了这一消息。We must face the fact that we have run out of all the money.我们必须面对我们已花完了钱这一事实。(1)In
16、 the dark forests _， some large enough to hold several English towns.Astand many lakesBlie many lakesCmany lakes lie Dmany lakes stand答案：B解析：表地点的介词短语放在句首时用完全倒装，表示某物位于某处用动词lie。2Altogether Dolly lived six and a half years, half the length of the life of the original sheep.多莉总共存活了6年半，是被克隆羊的寿命长度的一半。3Did
17、 she die young because she was a clone? 因为她是克隆的，所以才早逝了吗？young 为形容词，在句中做状语。在描绘性文字中，形容词(短语)或形容词化的分词有时起状语作用，说明主句所述的原因、时间或主语所处境况或意义增补。(1)表原因表原因的形容词(短语)或形容词化的分词多放在句首，句子的主语亦是其逻辑主语。表原因的形容词(短语)相当于原因状语从句。如：Thirsty and hungry (As he was thirsty and hungry), he went to a farmers cottage to ask for something to
18、 eat.由于又饥又渴，他来到一家农舍要点吃的。 Frightened(Because she was frightened), she asked me to go with her.由于害怕，她要我跟她一起去。(2)表时间形容词(短语)表主语动作发生的时间，放在句首。其作用相当于一个时间状语从句。如：Ripe (When they are ripe), the oranges taste sweet.这些橘子熟了时，味道甜美。(3)说明主语的境况或意义增补形容词(短语)表示主语所处境况或意义增补时，常放在句末。相当于一个和前面句子并列的句子。如：Holmes found the man l
19、ying on the floor, dead (and he was dead). 福尔摩斯发现那个人躺在地板上，死了。One woman was lying in bed, awake (and she was awake). 有位妇女醒着躺在床上。For a moment she just stood there, unable (and she was unable) to believe what had just happened.她在那儿呆呆地站了一会儿，不敢相信刚才发生的事情。(2008北京)After the long journey, the three of them w
20、ent back home, _.Ahungry and tiredly Bhungry and tiredChungrily and tiredly Dhungrily and tired答案：B解析：本题考查形容词做状语。4Besides that, there is also a fierce dabate over the question whether human cloning experiments should be allowed. 除此之外，克隆人的实验是否被允许进行的问题引起了激烈的争论。从句whether human cloning experiments shoul
21、d be allowed是同位语从句。Step5.Testing in class & improving skills（随堂检测，落实考点）Task5. Ask the Ss to finish the comprehensive exercises (1-3) in the bookStep6. Assessment & Homework（课堂评价，布置学案）Task1.Ask the students to finish Exs 1-3 at Page 12.Task2. Get the students to underline all the new words and phrases in the passage.
