单项选择题

This passage tells us ________.

A．it was the Panama Canal that made the country independent
B．It's nearly a century since Panama declared its independence
C．Panama was named by Columbus
D．Colombia used to be a state of the United States

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单项选择题

From the passage, we know ________.

A．Panama was ruled by three countries for 400 yeas
B．The United States controlled the Panama Canal for 22 years
C．The Panama Canal means a great deal to Panama' s economy
D．Panama is the smallest county in Central America

单项选择题

Panama was a Spanish colony ________.

A．from the 16th century to the 18th century
B．until 1903
C．for about 200 years
D．for 300 years and more