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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单项选择题
The age of the general practitioner is over. More and more graduates of medical schools tend to ______, that is, to concentrate on limited areas of their profession.
A．generalize
B．rationalize
C．study
D．specialize
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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