六级考试快速阅读实战练习（2） 六级考试快速阅读实战练习（2）

本实战练习能迅速帮助广大考生提高阅读水平，考生可在快乐阅读中提升应试水平，在应试备考中享受快乐阅读技巧篇，强化提高篇，精彩时文、美文导读篇，全真模拟冲刺篇。集知识性、趣味性、可读性于一体，篇篇精彩。富指导性、实用性、实战性...

The world was stunned by the news in the summer of 1995, when a British embryologist named Ian Wilmut, and his research team, successfully cloned Dolly the sheep using the technique of nuclear transfer. Replacing the DNA of one sheep’s egg with the DNA of another sheep’s the team created Dolly. Plants and lower forms of animal life have been successfully cloned for many years, but before Wilmut's announcement, it had been thought by many to be unlikely that such a procedure could be performed on larger mammals and life forms. The world media was immediately filled with heated discussions about the ethical implications of cloning.