[单选题]
1. Which of the foll)xusk*e: (dmu owing are involved in the loss )(9yyk no nm)wof heat from the body of a mam(y)n9 wmk noy)mal?
I. Erection of skin hair.
II. Vasodilation.
III. Vasoconstriction.
IV. Respiration in brown adipose tissue.
A. I and II only
B. II and IV only
C. II only
D. I, II and IV only
