单项选择题

A．______infected computer may lose its data.A．file
B．data base
C．virus
D．program
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单项选择题
The standard______in C language contain many useful functions for input and output，string handing，mathematical computations，and system programming tasks.
A．database
B．files
C．libraries
D．subroutine
单项选择题
A．executeB．．interpretC．compileD．maintain
A．execute
B．．interpret
C．compile
D．maintain
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