单项选择题

The passage is mainly about______.

A．the over-all pattern of American government
B．American governments at county level
C．American board of commissioners
D．American city districts
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单项选择题
New York City consists of______.
A．five independent counties
B．five districts and five counties
C．five separate districts as well as Arlington County
D．five separate townships
单项选择题
We can infer from the first paragraph that______.
A．farming people occupies a small proportion
B．farming people occupies a large proportion
C．the U. S used to be an industrial country
D．the U. S used not to be developed in agriculture
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