单项选择题

The writer suggest that ______.

A．breathing smoke is not good for one's health
B．smoke will enter the room by an open window
C．it is difficult for fresh air to reach the second floor
D．it is better to keep your head low when there is smoke in the room

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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

单项选择题

From the passage, we know ______.

A．Panama was ruled by three countries for 400 years
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