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

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单项选择题

In C language，functions are important because they provide a way to（）code so that a large complex program can be written by combining many smaller parts.

A．modify
B．modularize
C．block
D．board

单项选择题

Very long，complex expressions in program are difficult to write correctly and difficult to（）

A．defend
B．detect
C．default
D．debug

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