单项选择题

A．No using the computer.
B．Taking effective computing practices.
C．No connecting the internet.
D．Falling back on the specialist.
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单项选择题
A．Affecting the mouse.B．Affecting the keyboard.C．Affecting the hard disk.D．Affecting the crust of the computer.
A．Affecting the mouse.
B．Affecting the keyboard.
C．Affecting the hard disk.
D．Affecting the crust of the computer.
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