Which of the following should not be used when trying to escape a fire? The writer suggest that ______.

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问题 Which of the following should not be used when trying to escape a fire?
The writer suggest that ______.

选项 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