The （） has several major components, including the system kernel, a memory management system, the file system manager, device drivers, and the system libraries.

A．application

B．information system

C．operating system

D．iterative

下列不属于鸟类的繁殖行为的是（　　）

A．燕子筑巢

B．母鸡抱窝

C．麻雀争斗

D．家鸽育雏