“Some really industrious men affect to do only what they like, never working save when the spirit moves them.” What does the word “save” mean?
A、rescue 
B、spare
C、except
D、keep

A、为了实现软件的兼容和移植
B、缩短指令长度，扩大寻址空间，提高编程灵活性
C、为程序设计者提供更多、更灵活、更强大的指令
D、丰富指令功能并降低指令译码难度

A．老舍
B．林语堂
C．王敏
D．堺行夫