题目

人类社会发展经历的顺序依次应为 ①居无定所的群居                                  ②“只知其母，不知其父”的氏族 ③“既知其母，又知其父”的氏族           ④国家的出现 A．①②④③            B．①②③④             C．①④②③               D．②③①④.The two ladies are ________ the same age, but there seems to be ten years ________ them. A. at, between   B. about, among   C. as, among    D. of, between