单项选择题

Every valid character in a computer that uses even______must always have an even number of 1 bits.

A．parity
B．check
C．test
D．compare
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单项选择题
______is a device that converts images to digital format.
A．Copier
B．Printer
C．Scanner
D．Display
单项选择题
GIF files are limited to a maximum of 8 bits pixel，it simply means that no more than 256 colors are allowed in _______．
A．an image
B．a file
C．a window
D．a page
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