在人身意外伤害保险经营实务中，保险人对于极期意外伤害保险的被保险人进行风险程度评价的主要依据是被保险人所从事活动的性质。

单项选择题在法律上发生效力的死亡有多种情况。其中，订有失踪条款的人身意外伤害保险的保险人承担保险责任的死亡可以是推理死亡。

单项选择题In( ) database, the basic idea is that the data value is queried bythe key, the key can be a string type, and the value can be any typeof data, such as integer, character, array, list, collection, JSON,BLOB(Binary Large Objects)etc. It does not support queries based ondata values. It helps the developer to store schema-less data. Theywork best for shopping cart contents. () A、Key-valuedatabase B、Column based database C、Document-Oriented DB D、Graph based database