克利斯提尼改革中打破血缘关系，削弱氏族贵族势力的关键举措是（  ）

A．按财产多少划分等级

B．用10个地域部落取代原来的4个部落

C．公民大会是城邦最高权力机构

D．多数官职向各等级男性公民开放

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