(21)put computers to practical business use, but below the surface it is the heart of an(22) - the kernel - that provides the te

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问题 (21)put computers to practical business use, but below the surface it is the heart of an(22) - the kernel - that provides the technical wizardry to juggle multiple programs, connect to networks and store(23).A traditional kernel provides all the functions for applications. The kernel(24) memory, I/O devices and parcels out processor time.The kernel also supports(25) and fault tolerance, which is the ability to recover automatically when parts of the system fail.

选项 A、authentication
B、auto - correction
C、security
D、problem

答案C

解析 应用程序(Applications)使计算机有了实际的商业用途,但在这种表面现象之下(operating system),是操作系统(operating system)的内核为多程序间的切换、网络的连接和数据(data)存储提供了技术的支持。传统的内核为应用程序提供各种功能,内核管理(manage)内存、I/O设备并分配CPU的时隙。内核还支持安全机制(security)及容错机制,即当系统的一部分崩溃时,内核能够自动恢复。
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