题目

         the end of last week, he had interviewed more than 50          for his research about the online-learning.    A. At; passer-byB. By; passers-by C. By; passer-bysD. At; passers-bys 答案：B6．下列关于宗法制的评述，正确的有（　　）①是周人把血缘纽带同政治关系结合起来的一种措施②其核心是嫡长子继承制③有利于凝聚宗族，防止内部纷争④有利于强化王权。A．②③④B．①③④C．①②③D．①②③④