单项选择题

______ forms a natural boundary between Mexico and the United States.

A. The Ohio River
B. The Mississippi River
C. The Rio Grande River
D. The Ruhr River
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单项选择题
______ is the chemical capital of the world.
A. Huston
B. London
C. Melbourne
D. Sydney
单项选择题
The first official version of Bible known as the Great Bible was revised in the ______.
A. 15th century
B. 16th century
C. 17th century
D. 18th century
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