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    精英家教网 > 高中英语 > 题目详情
    ________ have an internal clock that controls the beating of our heart, and the ________ of our breathing.
    A．Human being; stepsB．Humans; pace
    C．Human beings; stepsD．Man; pace
    B
    B 考察名词。句义：人类体内有一个生物钟，它控制我们的心跳和呼吸的节奏。因为谓语是have，所以排除AD，humans="human" beings，但steo的含义是脚步，步伐；
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