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) 。

Messages that are sent electronically over a network.

A series of instructions (commands) performed in a sequence specifying actions to accomplish a task.

The character code built into most modem personal computers.

The minimal unit of information，it can have the value 1 or 0.

The brain of a computer, it contains the ALU, the clock, many registers, the bus interface and circuitry that makes these parts work together.

1（）

A．input

B．output

C．data

D．E-mail