The World Expo was like ________ great stage for cultural exchange, bringing people into closer contact with ________ rest of the world.[ ]

A．a; /  

B．the; /

C．a; the  

D．the; the

开机时显示如下出错信息：Non-systemdiskordiskerrorReplaceandstrikeanykeywhenready.则表示（）。

A、计算机硬件损坏

B、非系统盘或磁盘坏了，更换磁盘后再试

C、磁盘驱动器坏了，请更换

D、没有磁盘驱动器，请安装