单项选择题

The most important program on any computer is (73) .

A．Office 2000
B．Virus
C．software
D．Operating System
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单项选择题
Each Web(72)has its own unique address known as a URL(Uniform Resource Locator).
A．server
B．point
C．computer
D．site
单项选择题
The smallest unit of information in a computer system is called a(72)
A．Bit
B．Byte
C．block
D．file
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