单项选择题

The word "liability" (Line 4, Para. i) most probably means"

A．misfortune
B．disadvantage
C．instability
D．burden
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单项选择题
What's the best title for this passage
A．The Essence of Science and Scientists
B．On Distinguishing Fact from Fiction
C．The Definition of Pure Scientists
D．The Classification of Science
单项选择题
The example of the invention of a microscope demonstrates that pure science______.
A．is not always as practical as applied science
B．necessarily comes after applied science
C．may cause a multitude of immediate result if properly made use of
D．necessarily emerges from applied science
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