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.

1（）

A．coupled

B．dependent

C．independent

D．related

在唯物主义发展过程中，出现了三种基本形态，在下列选项中属于唯物主义的三种历史形态的有（）。

A.辩证唯物主义

B.朴素唯物主义

C.庸俗唯物主义

D.机械唯物主义