英语人教选修8课件：Unit2晨读晚诵

1、Unit 2 Cloning科学家们不断致力于发展克隆技术，那么克隆技术对人类有什么 样的意义呢？Why Clone?Research advances over the past decades have proved that we 1 humans can clone just about anything we want!But why would we , want to clone?Here are some of the reasons people give to explain that cloning is reasonableCloning for medical pur

2、posesOf all the reasons,cloning for medical purposes has the most potential to benefit large numbers of people.How might cloning be used in medicine?Much of what researchers learn about human disease comes from studying animal models such as mice.Often,animal models are genetically engineered to car

3、ry diseasecausing changes in their genes.Creating these animals is a long process.Cloning technologies might reduce the time needed to make a transgenic1 animal model,and the result would be a population of genetically identical animals for study.Stem cells2 are responsible for developing and repair

4、ing the body throughout life.As a result,they might be used to repair damaged or diseased organs and tissues3. Re searcher s are looking on cloning as a way to create genetically engineered human stem cells for research and medical purposesFarm animals are being genetically engineered to produce dru

5、gs that are useful in medicine.Just like creating animal models of disease,cloning might be a faster way to produce a large number of such animals.Bringing extinct species back to lifeIn the film Jurassic Park scientists use DNA preserved for tens of millions of years to clone dinosaurs.Could we rea

6、lly clone dinosaurs? In theory?Yes.In reality?Probably not.lt" s not likely that dinosaur DNA could survive undamaged for such a long time.However,|scientists have tried to clone species that became extinct more recently.Cloning humansTo clone or not to clone:that is a question.Human cloning is

7、 highly controversial and raises a number of problems.Why would people want to clone humans?One important reason is to help childless couples have children.From a technical point of view,before humans are cloned,we need to have a good idea of the risks involved单词注释1 .transgenic /trsenzdenlk/转基因的2. s

8、tem cell 干细胞3. tissue Ztlfu:/几（生物的）组织难句剖析1. Research advances over the past decades have proved that we humans can clone just about anything we want!译文在过去几十年里，科学研究的进展已经证明我们人类几乎能 够克隆我们想克隆的一切！咅I析 that we humans can clone just about anything we want在 句 中 做 prove的宾语。2It，s not likely that dinosaur DNA could survive undamaged for such a long time 译文恐龙的DNA在这么长的时间里不受损害而能保存下来是不可 能的。 I I II剖析It，s not likely that意为“是不可能的答案：1 .Cloning animal models of disease2. Cloning stem cells for research3. Cloning farm animals for drug production.4. Although it，s not likely to clone animals that becam