RIVERDOLPHINRUNNINGOUTOFTIMETheYangtzedolphinistheonlyk...
问题详情:RIVERDOLPHINRUNNINGOUTOFTIMETheYangtzedolphinistheonlykindofdolphinthatlivesinfreshwaterallitslife.ScientistssaythatthefinlessfreshwaterdolphinthathaslivedintheYangtzeRiverforover20millionyear...