所谓关系型数据库是以关系模型为基础的数据库。一个关系就是一张二维表。表中的行称为 【7】 ，表中的列称为 【8】 。
参考答案：[7] 元组 [8] 属性
与遗精的发病关系最密切的两脏是
A．心、脾B．心、肾C．脾、肾D．肝、肾E．肝、脾
— You don't go to that supermarket quite often, do you?
— No, I only go there _____ because it's too far away from my house. [ ]
A. eventually
B. constantly
C. occasionally
D. frequently
