求一篇介绍名人的英文ppt,英语课用的,长度为四分钟左右。麻烦帮个忙,谢谢啦!

发送到QQ邮箱87375009,谢谢啊

第1个回答  2010-05-11
Introduction
The possibility of human cloning, raised when Scottish scientists at Roslin Institute created the much-celebrated sheep "Dolly" (Nature 385, 810-13, 1997), aroused worldwide interest and concern because of its scientific and ethical implications. The feat, cited by Science magazine as the breakthrough of 1997, also generated uncertainty over the meaning of "cloning" --an umbrella term traditionally used by scientists to describe different processes for duplicating biological material.
第2个回答  2010-05-15
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