交通工具提供饮食、服务的单位和对入境、出境人员、交通工具、集装箱和货物实施检疫、监测、卫生监督的场所。( )
参考答案：对
However _____ they are designed, pens should function as a tool to write with.
A．differ
B．difference
C．different
D．differently
用树型结构表示实体类型及实体间联系的数据模型称为 (7) ；用二维表格表示实体类型及实体间联系的数据模型称为 (8) 。
