人教课标版高中英语选修8unit2usinglanguage (4).pptVIP

Unit 2 CloningUsing Language选修八 1996 cloning sheep 2001 cloning cattle 2002 cloning cats 2003 cloning horses 2005 cloning dogs 霸王龙 tyrannosaurus剑龙 stegosaurs雷龙 brontosaurus翼龙pterodactyl The return of Dinosaurs Read the text and answer the questions.Why shouldn’t you clone an extinct animal unless there is enough diversity in the group?There will not be enough genetic variation in the group to be able to resist new illnesses. 2. Why is it wrong to clone an extinct animal if it would live in a zoo? It is not a good idea to clone an animal that would live in a zoo because it is not a suitable habitat to develop and increase its numbers.The zoo is not a natural environment for a wild animal. Auroch (1627)Large wild cattle; long horns and hair; hair good for making into clothes; horn can be used for decoration; need grasslands. Dodo bird (1755)Unable to fly; friendly and not harmful; large eggs and tasty meat that could be developed for food; needs hot climate. Great Auk (1844)Very large bird that cannot fly；lives by and in the sea; feathers do not absorb water; useful for protecting clothes from water. Quagga (1883)Skin looks like a zebra; can be used for decoration; meat very tasty; needs warm climate. Discussion May the best animal win! Now in pairs discuss which extinct animals described above are worth restoring by means of cloning. Choose one and use the information to help you argue why this animal should be restored to the earth. Language study 1. strike…into people’s hearts使……刻骨铭心This tape struck what my teacher said before I left the school ten years ago into my heart. strikev. n. 打，撞击，袭击Strike while the iron is hot.v. （钟）敲，鸣，报时The church clock just struck twelve.vt. 突然想到，猛地意识到An awful thought has just struck me.vi. n. 罢工The coal miners struck for better safety conditions. 知识拓展striker n. 罢工的人striking adj. 引人注意的be/go on strike 罢工It strikes sb. that…某人突然想起…… 2. from time to time 有时，偶尔He looked at his watch from