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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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
IA] is [B] does [C] will [D] has
IA] is [B] does [C] will [D] has
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