单项选择题

What is the leading corn-producing state in the United States().

A. Nebraska.
B. Minnesota.
C. Iowa.
D. Indiana.

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The U.S. ranks () in the export of rice in the world.

A. first
B. second
C. third
D. fourth
单项选择题
What is America’s most important food crop().

A. Wheat.
B. Rice.
C. Barley.
D. Oat.
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