单项选择题

To test his theory, the chemist ______ an experiment.

A．set up
B．set out
C．set forth
D．set in
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单项选择题
John Locke, the well-known 18th century English thinker, emphasized experience as the ______ condition for expansion of human knowledge.
A．incompatible
B．incredible
C．indefinite
D．indispensable
单项选择题
With prices ______ so much, it is impossible for the company manager to stick to the original budget.
A．waving
B．swinging
C．fluctuating
D．vibrating
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