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單項(xiàng)選擇題

（）is a fast and powerful operating system， based on the UNIX O.S.

A. Windows 2012
B. Office 2016
C. Windows 10
D. Linux

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單項(xiàng)選擇題

（）is used to communicate with another computer over telephone lines.

A. keyboard
B. modem
C. mouse
D. printer

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The OSI model has （）layers.

A. four
B. five
C. six
D. seven