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
These sporadic attacks seem to indicate that the enemy is waging a war of ______ rather than attacking us directly.
A．fragments
B．attrition
C．intensity
D．words
单项选择题
He planned to go to France to ______ his art of painting.
A．cut out
B．come by
C．brush up
D．make up
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