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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

單項(xiàng)選擇題

The OSI model has （）layers.

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

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