单项选择题

（）is the address of a variable or a variable in which the address of another variable is stored.

A．Director
B．Pointer
C．Array
D．Record

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单项选择题
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．network
D．operating system
单项选择题
One use of networks is to let several computers share（）such as file systems,printers, and tape drives.

A．CPU
B．memory
C．resources
D．data
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