单项选择题

Limestone that can be highly polished is (termed) marble.

A．improved by
B．similar to
C．known as
D．substituted for
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单项选择题
The number of the Unites States citizens who are (eligible) to vote continues to increase.
A．encouraged
B．enforced
C．expected
D．entitled
单项选择题
The United States Congress and the state legislatures (approve) thousands of laws each year.
A．amend
B．debate
C．pass
D．draft
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