单项选择题

To define science we may simply call it ______.

A．the study of unrelated subjects
B．an attempt to explain natural phenomena
C．the study of unrelated fields
D．classified knowledge
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单项选择题
The best title for the passage is ______.
A．The Nature of Science and Scientists
B．Biology and the Scientific Age
C．Hypotheses and Theories
D．On Distinguishing Fact from Fiction
单项选择题
Pure science, leading to the construction of a microscope, ______.
A．may lead to antiscientific, "impure" results
B．necessarily precedes applied science, leading to the discovery of a cell
C．is not always as pure as we suppose
D．necessarily results from applied science and the discovery of a cell
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