单项选择题

The great ______ that have influenced the world's thinkers came not from committees but from individuals who groped for the truth in independent research.

A．obeservations
B．generalization
C．manifestation
D．catastrophes
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单项选择题
They greeted his proposal with ______ and refused to give it serious study.
A．incredulity
B．fickleness
C．derision
D．intensity
单项选择题
What we consider a luxury at one time frequently becomes a ______, many families find that ownership of two cars is indispensable.
A．fad
B．necessity
C．trend
D．nuisance
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