______ has an internal clock that regulates the beating of our hearts, and the ______ of our breathing.
A.Mankind; step | B.Human; pace | C.Human being; step | D.Man; pace |
推荐套卷
______ has an internal clock that regulates the beating of our hearts, and the ______ of our breathing.
A.Mankind; step | B.Human; pace | C.Human being; step | D.Man; pace |