單項選擇題（）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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1.單項選擇題（）is used to communicate with another computer over telephone lines.
A. keyboard
B. modem
C. mouse
D. printer
2.單項選擇題The OSI model has （）layers.
A. four
B. five
C. six
D. seven
