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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单项选择题
The United States ranks () in the world in the total value of its economic production.

A. first
B. second
C. third
D. fourth
单项选择题
Which of the following city is regarded as the financial capital of the world().

A. Washington D.C.
B. Los Angeles
C. New York
D. London
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