单项选择题

（）is a copy of a file for use in the event of failure or loss of the original.

A.second storage
B.buffer
C.backup
D.database

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单项选择题
（）is the basic software that allows the user to interface with the computer.

A.Display
B.Application
C.Screen
D.Operating System
单项选择题
（）is very fast storage used to hold data.It connects directly to the microprocessor.

A.CPU
B.Memory
C.Disk
D.I/0 device
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