问题
选择题
_____ 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
答案
答案:B
_____ 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
答案:B