题目内容
________ 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
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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