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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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
单项选择题
The most important result of the Lewis and Clark expedition was that it enabled the United States to claim the Oregon region.
A．regret
B．problem
C．outcome
D．controversy
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