A. is used both as a cultural and a physical object B. serves different purposes equally well C. is utilized by man D. can be of use to both man and animal 参考答案:C 答案解析:[解析] 细节题。本题问的是:当____的时候,矛和机器人有着相同的技术品质。根据文章第2段第3句“Until humans use a spear to hunt game or a robot t