Unit 3 A healthy life language points课时作业

Ⅰ. 阅读理解

Cloning means the production of genetically identical animals. In 1995 scientists at the Roslin Institute in Edinburgh，Scotland produced Megan and Morag-two lambs cloned from a single embryo. In 1996 Dolly the sheep was produced，the first example of a clone produced not from an embryo cell but from a cell taken from an adult sheep. Dolly died in 2003. Scientists predict that by 2050 they will be able to produce clones of people and decide how they look，how they behave and how much intelligence they have. Scientists will be able to do these things-but should they？In conclusion，the birth of Dolly is very essential in the area of cloning. The following pictures show us how Dolly was created.