单项选择题

According to the passage, a window is ______.

A．the only way of escaping a fire
B．the best place if you want to get out
C．one of the possible ways to escape a fire
D．safer than any other ways of escaping a fire

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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

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