________ I saw the beautiful­decorated house, I really wondered how she could manage that all by herself.

A．While

B．When

C．As long as

D．Now that

I/O接口根据CPU发来不同的（）来区别信息的性质，将信息存入相应的寄存器中.

A、数据信号

B、地址信号

C、状态信号

D、控制信号