A-A+
The number of times per minute that you breath
问题详情
The number of times per minute that you breathe is_______.
A.fixed at twenty-two times per minute
B.influenced by your age and sex
C.dependent upon the amount of fresh air available to you at any given time
D.controlled automatically by an unspecified body mechanism请帮忙给出正确答案和分析,谢谢!
参考答案
正确答案:D