—Betty suggested going to the park instead of shopping this Saturday.

—That's right, because most shops in this town are _____ on weekends. [ ]

A. close

B. closed

C. open

D. opened

建立空间要素之间的拓扑关系属于( )。

A．空间分析
B．图形分析
C．空间查询
D．图形整理