单项选择题

______ is permanently stored in the computer and provides a link between the hardware and other programs that run on the PC.

A．Interface
B．Operating system
C．Internet
D．Applicaion software
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单项选择题
The standard(70)in C language contain many useful functions for input and output， string handling，mathematical computations，and system programming tasks．
A．database
B．files
C．libraries
D．subroutine
单项选择题
One use of networks is to let several computers share______such as file systems, printers, and tape drives.
A．CPU
B．memory
C．resources
D．data
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