单选题
In 1900, the United States ranked first in the world in the production of ________.
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In 1900, the United States ranked first in the world in the production of ________.
The three Puritan traditions are ________.
The average life expectancy of the Red Indians is ________.
A trend that occurs at the same time with the movement to the South and the Weast of the United States is ________.
The largest and smallest states of the United States are ________.
The Mississippi, which is sometimes called ________, has played a vital role in the history of the United States.