阅读短文，判断对(√)错(×)。

      I have a happy family. My father is a police officer. His name is Bob. He is tall and handsome. My mother

is a doctor. Her name is Mary Smith. She is short and beautiful. I am a student. I am ten years old. I'm a pretty

girl. I love my family.

( ) 1. My father is a doctor.

( ) 2. My father is tall and handsome.

( ) 3. My mother is a police officer.

( ) 4. My mother is short and beautiful.

( ) 5. I am a boy.

在DOS系统的BIOS中常用I/O设备的驱动程序，下列设备中不是DOS常用I/O设备的是______。

A．鼠标

B．键盘

C．显示器

D．硬盘