【学习重难点】重点词汇、句型和语法的正确运用
【学法指导】阅读课本，回顾并梳理相关知识，然后关上课本，完成下列内容。
【知识链接】Read the text on Page 15 and answer the following questions :
1.What is the main idea of the passage ?
2.Tell the following statements true(T) or false (F) .
1)Scientists are still experimenting with cloning mammals because they think it can make money.( )
2)The animals that have disappeared from the earth , like dinosaurs , can be brought back to life through cloning.( )
3)Diversity in a group helps prevent animals from dying of the same illness.( )
4)Zoos are appropriate to cloned animals .( )
5)Scientists can only clone animals extinct 10,000 years ago.( )
