问题
单项选择题
An instruction is made up of operations that (68) the function to be performed and operands that represent the data to be operated on. For example, if an instruction is to perform the operation of (69) two numbers, it must know (70) the two numbers are. The processor’s job is to (71) instructions and operands from memory and to perform each operation. Having done that, it signals memory to send it (72) instruction.
A．first
B．last
C．next
D．second
答案
参考答案：C
解析： 全文解析：指令是由指定(specify)功能的操作和代表被处理的数据的操作数组成。例如，如果一条指令实现两个数的加法 (adding)，则它必须知道操作数在哪里(where)存放。处理器是用来从内存中获取(get)指令和操作数，并执行指令。当本条指令处理完后，它通知内存发送下一条(next)指令。