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
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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
单项选择题
According to the passage, the use of Antarctic krill as a food is an innovation whose future is ______.
A．basically gloomy but still uncertain
B．somewhat promising but very tentative
C．generally bright and virtually assured
D．endangered by certain technical problems
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