This passage is mainly about________. Which of the following statements is true?

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问题 This passage is mainly about________.
Which of the following statements is true?

选项 A、If a man does not breathe for minutes, his brain will be completely destroyed.
B、If you see someone drowning, you must give him mouth-to-mouth breathing.
C、Don’ t stop pressing his chest, if the drowning man starts breathing again.
D、When pressing, you can do it as hard as you can.