单项选择题

（）is a query language for manipulating data in a relational database.

A．Assemble
B．SQL
C．C++
D．Fortran

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单项选择题
（）is a file that contains metadata-that is,data about data.

A．document
B．Excel table
C．database
D．data dictionary
单项选择题
（）has many elements:text,audio sound,static graphics images,animations,and full-motion video.

A．Multimedia
B．Database
C．File
D．Document
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