2018届高二英语选修8教学精品课件(人教版)：Unit 2 Cloning

课件39张PPT。【美文阅读】　 Pandas can be saved by cloning? 从1998年中国科学院动物研究所首席科学家、动物克隆与受精生物学学科带头人陈大元首次正式提出克隆大熊猫到现在，整整16年过去了，陈老仍然执著于此。然而保护大熊猫，究竟要不要通过克隆的方式呢？The move was considered as one of the 10 biggest achievements of science and technology in 1999.It won an award of 6 million yuan and further funding of 5 million yuan for the project from the Ministry of Science and Technology. At first，two embryos were created from a surrogate mother(代母) cat who became pregnant after being in- jected with a blastocyst，but the experiment was abandoned after the cat died.Chen and his team then experimented with surrogacy on black bears.After three years of effort，a black bear became pregnant and the shape of a fetus(胎儿) could be seen on an ultrasound scan(超声波扫描检查)．However，the research was stopped in 2005 because the fetus did not completely develop before the project's deadline.“Those who are against cloning have made their voices heard throughout the research project on cloning giant pandas.Some people believe cloning goes against nature，but it is actually a pioneering technology.If successful，it is a way to save endangered animals，”Chen said. Some scientists take a different view.“While I agree that research on cloning is meaningful，it is inappropriate to use giant pandas in this type of experiment.The number of pandas is limited and human beings have yet to master knowledge about pandas' pregnancy.Cloning would do little to save the species，”said Wang Dajun，a researcher at the School of Life Sciences，Peking University. In response，Chen said that he would continue his research.【诱思导学】　 1．Do you think pandas can be saved by cloning？Why? _____ 【答案】　省略 2．Why are some scientists against cloning pandas? _____ 【答案】　Because they think cloning go against nature.教师用书独具演示●教学目标 本课时主要是通过学生对学案所给出的内容的学习，了解本课文中所出现的词汇，初步了解课文以及相关的背景知识，为下一堂课对课文的全面理解起到一个铺垫作用。●教学地位 本单元的中心话题是“克隆”。克隆意为无性繁殖，克隆技术即是无性繁殖技术。1997年英国罗斯林研究所试验成功的克隆羊多莉是首次利用体细胞克隆成功的，它在生物工程史上揭开了新的一页。本单元内容具体涉及“什么是克隆”、“克隆羊多莉是如何诞生的”、“克隆的利弊”等。语言技能和语言知识都是围绕“克隆”这一中心话题设计的。目的在于让他们了解有关克隆的知识和科普文章的一些基本特征和写作方法，自己尝试写简单的辩论报告。 ●新课导入建议 可以通过让学生看和讨论教材P10的“热身”(Warming Up)的图片：克隆羊多莉、人类的双胞胎、草莓的自然无性繁殖以及插枝繁殖的植物等导入新课。要求学生分组讨论，了解两种不同的克隆：自然克隆和人工克隆。为下面的阅读做好铺垫。 老师要尽量给学生自主学习的时间和空间，通过自学、自做、自悟、自助等方式，让学生更好地体会和理解文章的内容 。 演示结束 Ⅰ.篇章结构 阅读P11－12的Reading部分，然后完成下列表格【答案】　1.exact copy of　2.uses　3.quantities of plants 4．the disturbing news　5.cast down　6.half ... ...