Expandingpopulationsandsteadilyimprovingcommunicationsb... 国语站 题库 1.87W 大中小设置文字大小 问题详情:Expanding populations and steadily improving communications brought more trade and contact, but also more _______ between social groups. A. cooperation B. friction C. liberation D. distribution【回答】B知识点:名词题型:选择题 TAG标签:#