The high-anxiety focus on reading score may have narrowed student________to knowledge about the world that can improve their reading.

A．idea

B．aid

C．belief

D．access

计算机的硬件主要包括中央处理器(CPU)、输入设备、输出设备和( )。

A．键盘

B．鼠标

C．存储器

D．显示器