单项选择题

The term, （）loop, refers to a loop that is contained within another loop.

A．program
B．nested
C．statement
D．network

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单项选择题
A（）is a named momory block . By using its name, we can refer to the data stored in the memory block.

A．word
B．record
C．program
D．variable
单项选择题
In computer sience , a data（）is a way of storing data in a computer so that it can be used efficiently.

A．record
B．file
C．structure
D．pool
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