操作系统的重要功能是负责管理计算机中的各种硬软件资源，并控制各类软件运行。
参考答案：对
—Nina, don't ______ speaking in public. You are not a small girl.
—I know. I'll try my best to be brave. [ ]
A. be terrified to
B. be afraid of
C. be afraid to
D. be terrified in
米糠在配合饲料中不宜使用过多，过多会使肉质变软。
