单项选择题

In the U. S. , the senatorial term is ______ years.

A．3
B．4
C．6
D．8
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单项选择题
The major source of income of Irish farmers is ______.
A．wheat
B．fruits
C．livestock
D．potatoes
单项选择题
______ is not a U.S. news and cable network.
A．ABC
B．CNN
C．CBS
D．BBC
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