英语选修8第二单元using language 导学案

Unit 2 The Return of The Dinosaurs? 导学案Learning aims: 1 to learn some useful words and expressions and some information about cloning 2 to improve reading ability 3 learn to love science and nature课前自主预习 重点单词1 no longer in existence _2 a belief or feeling that sth. is true and that sth will happen although there is no proof _3 the act of controlling or directng according to rule _4 happening at the beginning:first _5 a disadvantage or problem that makes sth. a less attractive idea _6 fair,practical and sensible_重点短语1状况很好（坏）_ 2 不时 偶尔_3 使复活 _ 4 使刻骨铭心_5白费力气_ 6 最初要求_完成句子1 scientists are still experimenting with cloning mamals. 要点提取：experiment with/on sth. 做实验例句仿写：有人认为在动物身上做实验会引起不必要的痛苦。Some people feel that _animals causes unnecessary suffering.2 The desadvantage is tht if there is a new illness some of these animals may die, but others will survive and pass on the ability to resist that disease to the next generation.要点提取：the disadvantage is that 其缺点是 Pass onto 把.转交（递给，传给）例句仿写： 骑自行上班的优势是我们能过低碳生活。_we can live a low-carbon life.看完那本事后请传给我。 _the book_me when you have finished it3 based on what we know now, you cannot clone animals that have been extinct longer than 10,000 years. 要点提取：based on +what 引导宾语从句例句仿写： _was shown on the survey,we can make a better understading about the thing _we have done to nature.课堂互动探究Task 1: Group Discussin: In fact, do you think there is any possibility that scientists bring extinct dinosaurs to life as a clone ? Why (not) ? Task 2: Fast Reading 1 Match the main idea of each paragraphPara1 explain the impossibility of cloning dinosaurs Para2 conclude that its just a dream Para3 introduce the topic of the passage2 Which of the following is the authors attitude to cloning extinct animals?The writer of the text_ A. is excited by the possibility of cloning fierce and extinct animals. B. believes that extinct animals can be brought back to life by cloning. C. thinks it impossible or unsuitable to clone extinct animals like dinosaurs . D. dreams of dinosaurs returning to the earthTask 2: careful-reading 1 Give some reasons why it is either impossible or unsuitable to clone extinct animals. Reason 1: Perfect DNA is _to obtain.Reason 2: All the cloned animals have _arrangement of genes so that there is _diversity in the group to overcome difficulties, which means they might die of _illness.Reason 3: A lack of_2 Based on what we know now, you cannot clone animals that have been extinct longer than_ years. 3 The chance of dinosaurs returning to the earth is merely _.4 Why shouldnt you clone an extinct animal unless there is enough diversity in the group?5 Why cant you clone the DNA of animals that have been extinct longer than 10,000years?After-reading 1 DiscussionAre you in favor of cloning extinct animals? Now in pairs discuss which animals described below are worth restoring by means of cloning. Choose one animal from the t