单项选择题

The word "underscore" in the last sentence of the text probably means"______".

A．underestimate
B．ignore
C．emphasize
D．accelerate
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单项选择题
An operating system is no guarantee of online security probably because ______.
A．some OS suppliers are not trustworthy
B．it still fails to shield users from intrusions
C．antivirus software is not updated in due time
D．some terminals are not installed with such a system
单项选择题
Which of the following elements is the most critical to online security according to the author
A．IT culture.
B．Operating systems.
C．Desktop antivirus software.
D．The efforts by online security vendors.
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