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
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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
单项选择题
A scientist interested in adding to our general knowledge about oxygen would probably call his approach ______.
A．applied science
B．agriculture science
C．pure science
D．environmental science
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