单项选择题

A ______ is used to communicate with another computer over telephone lines.

A. keyboard
B. modem
C. mouse
D. printer
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单项选择题
（31）是（）

A.automated
B.distinguished
C.authenticated
D.destructed
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. operating system

D. iterative
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