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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Which of the following statements does the author imply

A．In science, it is not difficult to distinguish fact from fiction.
B．Today few people have any notions of the meaning of science.
C．Practical-minded people can understand the meaning and objectives of pure science.
D．Scientists engaged in theoretical research should not be blamed for ignoring the practical side of their discoveries.

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The best title for the passage would be ______.

A．Hypotheses and Theories
B．On Distinguishing Fact from Fiction
C．The Nature of Science and Scientists
D．Biology and the Scientific Age

单项选择题To define science we may simply call it ______.

A．classified knowledge
B．the study of unrelated fields
C．the study of unrelated subjects
D．an attempt to explain natural phenomena

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