Listen to the passage about animal cloning and fill in the blanks . tadpole: 蝌蚪 somatic: 身体的,体壁的 embryonic: 胚胎的 strip: 剥去 gaur: 野牛 traumatic: 创伤的 Scientists have been cloning animals for many years. In 1952, the first animal, a tadpole, was cloned. Before the _________(1) of Dolly, the first mammal cloned from the cell of an adult animal, clones were created from embryonic cells. Since Dolly, __________(2) have cloned a number of large and small animals including sheep, goats, cows, __________(3) , pigs, cats, rabbits, and a gaur. All these clones were created using ____________(4) transfer technology. Hundreds of cloned animals exist today, but the number of different __________(5) is limited. __________(6) at cloning certain species have been unsuccessful. Some species may be more _________(7) to somatic cell nuclear _________(8) than others. The process of stripping the nucleus from an egg cell and replacing it with the nucleus of a donor cell is a traumatic one, and __________(9) in cloning technologies may be needed before many species can be cloned _________(10) .