单项选择题

（） The brains 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

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单项选择题

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

A．byte
B．bit
C．logic
D．true

单项选择题

（） The character code built into most modern personal computers.

A．ASCII
B．internet
C．interface
D．Windows

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