单项选择题

() is the nation’s leading center of heavy industry.

A. Midwest
B. Northeast
C. Southeast
D. Southwest

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单项选择题
What is the leading corn-producing state in the United States().

A. Nebraska.
B. Minnesota.
C. Iowa.
D. Indiana.
单项选择题
The U.S. ranks () in the export of rice in the world.

A. first
B. second
C. third
D. fourth
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