以下各段叙述给出了 5 个计算机专业英文术语的英文解释。这些英文专业术语依顺序分别是(1) 、(2) 、(3) 、(4) 和(5) 。
（1）Messages that are sent electronically over a network.
（2）A series of instructions(commands) performed in a sequence specifying actions to accomplish a task.
（3）The character code built into most modern personal computers.
（4） The minimal unit of information, it can have the value 1 or 0.
（5）The brain of a computer, it contains the ALU, the clock, many registers, the bus interface and circuitry that makes these parts work together.
The brain of a computer, it contains the ALU, the clock, many registers, the bus interface and circuitry that makes these parts work together.（）
A．memory
B．CPU
C．I/O device
D．program
