__________lessons were not difficult.

A．Our few first short English

B．Our first few short English

C．Our few first English short

D．Few our first English short

完成一个汇编语言用户程序的编制和调试，通常需经过四个步骤：首先用编辑程序编出用户的源程序，然后通过运行汇编程序获得用户的______程序(文件)，接着运行连接装配程序，产生用户的______程序(文件)，最后通常使用______程序调试运行用户程序。