单项选择题

（）are designed to manage large bodies of information.

A．I/O ports
B．Printers
C．Database system
D．Keyboards

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单项选择题
（）provides a data path between the CPU and external devices.

A．Keyboard
B．I/O port
C．Disk
D．Printer
单项选择题
Computer（）is used to temporarily store data.

A．CPU
B．disk
C．memory
D．I/O
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