Unit 2 Cloning
1996年克隆羊多莉的诞生，就已为克隆人做好了技术上的准备。也使关于克隆人的争论变得更加现实。
Human cloning is the creation of a genetically identical copy of an existing or previously existing human.Despite several highly public claims，human cloning still appears to be a
fiction.There is no solid scientific evidence that anyone has cloned human embryos at present.
In 2004，a group in South Korea published a paper in the journal Science in which it claimed to have created a cloned human embryo in a test tube.However，an independent scientific institute later found no proof to support the claim and，in January 2006，Science announced that the paper had been withdrawn.
In January 2008，Dr Samuel Wood and Dr Andrew French in California announced that they successfully created the first 5 fully grown human embryos using DNA from adult skin cells，aiming to provide a source of viable embryonic stem cells.But Dr Wood stated that if that were possible，using the technology for reproductive cloning would be both immoral and illegal.The 5 cloned embryos were destroyed.
The various forms of human cloning are controversial.Most scientific，governmental and religious organizations oppose reproductive cloning.Therefore，some people have considered the idea of growing organs separately from a human organism－in doing this，a new organ supply could be established without the moral problem of harvesting them from humans.
1．genetically adv. 从遗传学角度，从基因角度 2．viable adj. 切实可行的，有望实现的 3．reproductive adj. 生殖的，再生产的
1．What is human cloning?
Human cloning is a creation of genetically identical copy of an existing or previously existing human. 2．Which country is the first to claim to have created a cloned human embryo? South Korea. Section Ⅰ Warming Up & Reading－
Preparing
根据提示写出下列单词 1． vi. 2． vt. 3． vt. 4． vi. 5． vt. 6． vt. 7． vt. 8． vt.&vi. 9． adj. 10． n.
不同；相异 着手；从事；承担 扔；投；掷 反对；不赞成 获得；赢得
获得；到达(水平、年龄、状况等) 禁止；不准 积累；聚积 精确的；准确的 突破
【答案】 1.differ 2.undertake 3.cast 4.object 5．obtain 6.attain 7.forbid 8.accumulate 9．exact 10.breakthrough
breakthrough为合成词，看单词 学构词：由break和through构成类似单词还有breakup“破裂”；breakdown “失败，损坏，破裂”等。
根据提示补全下列短语 1．pay
得到好结果；取得成功；偿清
2． the one hand 一方面 3．cast
使失望；使沮丧
4．have an impact 对……有影响 5． present 6． favour of
目前；现在 赞成；支持
【答案】 1.off 2.on 3.down 4.on 5.at 6.in
根据提示补全下列教材原句
1．Cloning plants is straightforward while cloning animals is very complicated. 克隆植物简单而克隆动物非常复杂。
2．Then came the disturbing news that Dolly had become seriously ill. 接着传来了多莉病重的坏消息。
3．However，scientists still wonder whether cloning will help or harm us and where it is leading us.
然而科学家们仍对克隆技术有助于人类还是有害于人类以及它将把我们引向何处感到困惑。
阅读P11－12课文，选择最佳答案
1．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 dies earlier than the original one D．is usually as healthy as the original one
2．Which of the following is an advantage of cloning? A．Cloning can be used for earning money.
B．Large quantities of food can be produced by cloning.
C．Cloning can not help keep animals from becoming extinct. D．Famous persons who have passed away can be cloned. 3．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 4．What can we learn from the text?
A．Cloned mice can live as long as the original ones. B．Cloning will come to an end because of objections. C．All the research into human cloning will be forbidden. D．It is more difficult to clone animals than clone plants. 5．We can infer from the last three paragraphs that ．
A．the normal development of Dolly had no effect on the cloning of other species B．Dolly's serious disease and final death disturbed the whole world C．Dolly successfully cloned a new lamb with the help of cloning scientists D．there were arguments about animal cloning and concerns about the future of cloning
【答案】 1－5 CBDDD
阅读P11－12课文，在空白处填入适当内容(1个单词)或括号内单词的
正确形式
Cloning is a way of making an 1. (exactly)copy of another animal or plant.Cloning plants is straightforward 2. cloning animals is very complicated.It is a difficult task 3. (undertake)．Many attempts to clone mammals failed.But at last the determination and patience of the scientists paid 4. in 1996 with 5. breakthrough—the cloning of Dolly the sheep.Dolly's appearance raised a storm of 6. (object)and had a great impact on the 7. (medium)and public imagination.Altogether Dolly 8. (live)six and a half years，half the length of the life of the original sheep.
At present some countries began to reform their legal systems and 9. (forbid)research into human cloning，but other countries like China and the UK，continued to accumulate evidence of the abundant 10. (medicine)aid that cloning could provide.
【答案】 1.exact 2.while 3.to undertake 4.off 5.a 6.objections 7.media 8.lived 9.forbade 10.medical
