题目内容

( (____)) is the heart of a computer system.

A. Memory
B. Hard disk
CPU
D. Keyboard

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Some keys on keyboard have two characters. When we want to get the upper character we should hold () and press the key.

A. Ctrl
B. Shift
C. Alt
D. any of the above

One KB equals () bytes.

A. 512
B. 1024
C. 1000
D. 2048

When we want to open an item, we can point to the item, and ( ) the mouse.

A. right-click
B. click
C. double-click
D. drag

Which of the following is not a desktop operating system?

A. Microsoft Windows
B. OS X
C. Linux
D. Android