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
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单项选择题
In an allergic reaction, the immune system mistakenly ______ a harmless substance as a harmful one.
A．translates
B．dubs
C．interprets
D．produces
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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