________ 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 考察名詞。句義：人類體內(nèi)有一個生物鐘，它控制我們的心跳和呼吸的節(jié)奏。因為謂語是have，所以排除AD，humans=human beings，但steo的含義是腳步，步伐；

 

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