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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单项选择题
It is important that employees stick to their company's security policies because ______.
A．they are the ultimate users of the network
B．everyone will have to follow the rules anyway
C．they often make errors in operating their systems
D．security breaches are often caused by their blunders
单项选择题
Pure science, leading to the construction of a microscope, ______.
A．is not always as pure as we suppose
B．may lead to anti-scientific, "impure" results
C．necessarily results from applied science and the discovery of a cell
D．necessarily precedes applied science, leading to the discovery of the cell
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