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    3．Peoplebreathe（呼吸） more slowly when they are asleep．

    分析 当人们睡着的时候，他们呼吸地更慢了．

    解答 答案：breathe
    此处在主句中作谓语；根据从句when they are asleep使用了一般现在时可知，本句描述的是人们睡着时的通常状况，所以这里应使用一般现在时；由于主语People表示复数，故填breathe

    点评 本题考查了单词拼写；做类似的题时，除了掌握单词的正确拼写外，还应结合句意，从语法分析的角度去判断句中所填单词的形式；在本题中，由于空缺处在主句中作谓语，并且根据从句的时态以及主语的单复数形式，确定出了此处所填单词的形式应是动词原形breathe．

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