Unbelievable as it is, the film 2012 without doubt________ a warning that human beings are faced with potential dangers

A．belongs to

B．serves as

C．exists in

D．accounts for

施工文件立卷时，卷内资料排列顺序要依据卷内的资料构成而定，一般顺序为( )。

A．目录—封面—文件部分—备考表—封底

B．备考表—封面—目录—文件部分—封底

C．封面—目录—文件部分—备考表—封底

D．目录—备考表—封面—文件部分—封底