单选题 The main function of a processor is to (68) and carry out instructions which usually consist of operation and (69) . The term to measure the speed of the processor is called a Megahertz (MHz), which means million (70) per second.

【正确答案】 B
【答案解析】[解析] 译文：处理器的主要功能是解释和执行指令。指令通常由操作码和操作数构成。
【正确答案】 A
【答案解析】[解析] 略
【正确答案】 C
【答案解析】[解析] 译文：衡量处理器速度的单位是兆赫兹(MHz)，即每秒一百万个周期。