单击此处编辑母版标题样式单击此处编辑母版文本样式第二级第三级第四级第五级Unit2 cloning Reading The important events in animal cloning historyIn 1952 tadpole(蝌蚪) was cloned . It is the first animal to be clonedIn 1963 an Asian carp(鲤鱼) w