Unit 2 Cloning Section Ⅳ Learning about Language &;Using Language [原文呈现][读文清障] THE RETURN OF THE DINOSAURS
The possibility of cloning fierce and extinct ① wild animals ② has always excited film makers
And they are not the only ones
The popularity③ of films such as④JurassicPark⑤ , in which a scientist clones several kinds of⑥ extinct dinosaurs, proves how the idea struck⑦ a mixture of fear and excitement into people's hearts⑧
But in fact we are a long way from being able to clone extinct animals
Scientists are still experimenting with⑨ cloning mammals
This is because⑩ the cloning of mammals is still a new science and its story only began seriously in the 1950s as this list shows⑪:1950s cloning of frogs1970s research using the embryos of mice⑫1979 work on embryos of sheep and mi