人教新课标版高二选修8 Unit2 Cloning Reading and language points ppt课件.pptVIP

Pre-reading What is clone? How is clone produced? What benefits can human gain from cloning? What problems may arise when human beings are cloned? 1. What is clone? Clone is a way of making an exact copy of another animal and plant. 2. How is clone produced? This happens in plants when gardeners take cuttings from growing plants to make new ones, and when small parts of a plant are taken and grown in a laboratory. It also happens in animals when twins identical in sex and appearance are produced from the same original egg. 3. What benefits can human gain from cloning? 4. What problems may arise when human beings are cloned? While-readingSkim and sum up the main idea of each paragraph. Para.1 cloning is a way of making an exact copy of another animal or plant. Para.2 cloning have two major uses. Para.3 The problems of Dolly Para.4 The effect of Dolly Para.5 It is forbidden to clone human being. The main idea of the text is____ A. animal cloning is very valuable and can benefit the world. B. animal cloning could be misused by bad people so it must be forbidden C. animal cloning is well developed because Dolly the sheep was born. D. animal cloning raised arguments and scientists are not sure about its future. 2. Which of the following statements about cloning is NOT true according to text?____ Cloning is something that has been developed quite recently. Twins that look exactly the same are originally from the same egg. Cloning is used by gardeners to make more money. D. Animal cloning is much more difficult than plant cloning. 3. The cloning of Dolly the sheep succeeded because____. its easier to clone a sheep than other animals