单项选择题

An expert in any field may be defined as a person who possesses specialized skills and is capable of rendering very competent services.

A．obtaining
B．mastering
C．providing
D．financing
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单项选择题
Recent discoveries in Montana indicate that some dinosaurs may have resided in colonies.
A．lived
B．died
C．hunted
D．fed
单项选择题
High wages and restrictive work practices are said to have created new nonunion competition.
A．inefficient
B．recognized
C．limiting
D．dangerous
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