单项选择题

A scientist interested in general knowledge about oxygen would probably call his approach ______.

A．applied science
B．chemical science
C．pure science
D．environmental science
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单项选择题
Which of the following sentences about pure science is true
A．It may lead to antiscientific, impure results.
B．It necessarily precedes applied science.
C．It is not always as pure as we suppose.
D．It necessarily results from applied science.
单项选择题
Which of the following is the best title for this passage
A．On Distinguishing Fact from Fiction
B．Biology and the Scientific Age
C．Hypotheses and Theories
D．The Nature of Science
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