15-Animal word origins 动物词语的词源 http://media.cp.com.cn/wp-content/uploads/2016/11/18071715-Animal-word-origins.mp3
13-Widespread birds 分布广泛的鸟类 http://media.cp.com.cn/wp-content/uploads/2016/11/18071713-Widespread-birds.mp3
12-Widespread creatures 分布广泛的动物 http://media.cp.com.cn/wp-content/uploads/2016/11/18071712-Widespread-creatures.mp3
11-Animals of the polar regions 极地动物 http://media.cp.com.cn/wp-content/uploads/2016/11/18071711-Animals-of-the-polar-regions.mp3
10-Life in the ocean 海洋动物 http://media.cp.com.cn/wp-content/uploads/2016/11/18071710-Life-in-the-ocean.mp3