托福阅读tpo_2_The_Origins_of_Cetaceans鲸类的起源原题解析
阅读原文:It should be obvious that cetaceans-whales, porpois, and dolphins-are mammals. They breathe through lungs, not through gills, and give birth to live young. Their streamlined bodies, the abnce
时间:2023-07-27 热度:21℃