人教英语选修8第二单元复习课.ppt

1. What is a clone? Twins A strawberry plant 1996 cloning sheeps 2001 cloning cattle 我国成功繁殖克隆兔 体形要比普通兔大许多 2002 cloning cats 2005 cloning dogs 3. Dolly the sheep _____. A. looked exactly like the sheep that provides the egg. B. was the exact copy of the sheep that provides the nucleus. C. looked like the sheep that gave birth to it. D. had the characteristics of all three sheep. 4. It can be inferred from the passage that  a cloned animal_____. A. usually lives as long as the original one B. usually lives longer than the original one C. usually dies earlier than the original one D. is usually as healthy as the original one 5. Which of the following is not an advantage of cloning? A. Cloning can be used for medical purposes. B. Large quantities of food can be produced by cloning. C. Cloning can help keep animals from becoming extinct. D. Famous persons who have passed away can be cloned. 6. Which statement is NOT true? A. Cloning is something that has been developed quite recently. B. Twins that look exactly the same are originally from the same egg. C. Cloning is used by gardeners to make more money. D. Animal cloning is much more difficult than plant cloning. 7. The cloning of Dolly the sheep succeeded because _____. A. it’s easier to clone a sheep than other animals B. the scientists were determined and worked hard with patience C. the scientists were rewarded and got lots of money D. many other attempts to clone mammals failed 10. 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 clonin