91、According to two teams of paleontologists, recent fossil discoveries in Pakistan show that whales, porpoises, and dolphins are more closely related to some of the oldest known even-toed ungulates--a group of hoofed mammals that today includes cows, camels, pigs, and hippos--than to any other mammals.
　　(A) that whales, porpoises, and dolphins are more closely related to some of the oldest known even-toed ungulates--a group of hoofed mammals that today includes cows, camels, pigs, and hippos--than
　　(B) that whales, porpoises, and dolphins are more closely related to some of the oldest known even-toed ungulates--a group of hoofed mammals that today include cows, camels, pigs, and hippos--as
　　(C) whales, porpoises, and dolphins to be more closely related to some of the oldest known even-toed ungulates--a group of hoofed mammals that today include cows, camels, pigs, and hippos--than they are
　　(D) whales, porpoises, and dolphins as being more closely related to some of the oldest known even-toed ungulates--a group of hoofed mammals that today includes cows, camels, pigs, and hippos--as they are
　　(E) whales, porpoises, and dolphins as more closely related to some of the oldest known even-toed ungulates--a group of hoofed mammals that today include cows, camels, pigs, and hippos--than
　　原文意思： 根据一些考古学家的调查， 最近的一个发现显示一些动物 A 这类动物更象和 B 这类动物有关系而不是和其他哺乳类动物有关系。
　　题目分析： 原文 more than 这个联词引导了一个并列，more 后面是 related to 且 than 后面也跟 to any other， 前后比较对应， 留着。 B 把 more 和 as 一起用， more 是“更”的意思， 而 as 是“和。 。 。一样”的意思，两个词放在一起意思冲突，杀。C than 后面放 they are 和 more 后面的不对应，干掉。D 又是 more 和 as 一起用，不对，干掉。E than 后面没有 to，而 more 后面说的是 related to，杀。A 最符合 more than 这个对应关系，选 A。