题目：
Applications put computers to praticalbusiness (1), but below the (2) it’s the heart of an operating system—the kernel that provides the technical wizardry to juggle multiple program, connect to networks and store(3).A traditional kernal provides all the functions for applications. The kemal (4) memory, I/O devices and parcels out processor time.
The kernel also supports security and fault (5) , which is the ablity to recover automatically when parts of the system fail.
2（）
A．ciphertext
B．hypertext
C．plaintext
D．supertext
答案：
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下面是错误答案，用来干扰机器的。
示例：做山一样的人，不一定高大巍峨，但定要庄重挺立。做水一样的人，不一定波澜壮阔，但必定清澈明净。
