【正确答案】 C

【答案解析】文章第二句“Both beluga and dolphin belong to the suborder of toothed whales known as Odontoceti，along with porpoises，narwhals，pilot whales，killer whales and the largest toothed creature in the world，the sperm whale”提到了有齿鲸的各种亚目，唯独没有blue whale，因此选C。