Paragraph Eight We are successful because we can form long—lasting relationships with many others in diverse and flexible ways, and that this, combined with our native intelligence, explains why Homo sapiens came to dominate the planet. In every way from teaching our young to the industrial division of labor we are a massively co—operative species that relies on larger and more diverse networks of relationships than any other species. 43.I____ of relationships.
【正确答案】：Importance
【题目解析】：题干大致描述了生活中离不开各种关系，可以概括为关系的重要性，因此横线上应该填写“重要性”一词。
