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    ________ have an internal clock that controls the beating of our heart, and the ________ of our breathing.

    A．Human being; steps B．Humans; pace

    C．Human beings; steps D．Man; pace

     

    B

    【解析】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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