Analogous estimating ______ .

A) uses bottom-up estimating techniques
B) uses the actual cost of previous. similar projects as the basis for estimating the cost of the current project
C) is used most frequently in the later stages of a project
D) summarizes estimates for individual work items

根据保护文物的实际需要，经省、自治区、直辖市人民政府批准，可以在文物保护单位的周围划出一定的（）。

A．保护区 

B．发掘 

C．经济发展区 

D．建设控制地带