单项选择题

The best rifle of this passage can be______.

A．The Tips You Must Follow
B．How to Start out with a Computer
C．How to Use Your PC Better
D．How to Keep Your PC Stable (稳定)
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单项选择题
It can be inferred from the last paragraph that ______.
A．your computer will copy the important information when the system fails
B．your computer might lose all the information when its hard drive crashes
C．you have to replace your computer one day
D．you must change your system regularly
单项选择题
How many pieces of advice on buying good hardware does the writer give us
A．Three.
B．Two.
C．One.
D．Four.
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