单选题 In C language，functions are important because they provide a way to (69) code so that a large complex program can be written by combining many smaller parts．

A．modify B．modularize C．block D．board
【正确答案】 B
【答案解析】[解析] ：在C语言中，函数是很重要的。因为函数具有把代码模块化的功能，通过代码模块化，一个大且复杂的程序能够写成多个小程序的组合。