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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单项选择题
() is reputed as the automobile capital of the world.

A. London
B. Los Angeles
C. Toronto
D. Detroit
单项选择题
Forests cover nearly()of the United States, and they yield many valuable products.

A. a fourth
B. a third
C. half
D. two thirds
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