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．He wants to wait until the class is full.B．He wants to take the class if someone drops it.C．He will wait for the professor.D．He is late and there are no more chairs.
A．He wants to wait until the class is full.
B．He wants to take the class if someone drops it.
C．He will wait for the professor.
D．He is late and there are no more chairs.
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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