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
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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
单项选择题
Among the men and women who reshaped the American working class during the early 1900s, there were many who were not members of labor unions.
A．challenged the rights of
B．criticized the views of
C．interviewed the leaders of
D．changed the character of
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