Which of the following is not a contributory factor to thermoregulation in the preterm neonate

A. Immature central nervous system (CNS).
B. Large skin surface area.
C. Lack of subcutaneous (S. Ｃ. ) and brown fat.
D. Tendency toward capillary fragility.

下列具有社会行为的动物是[ ]

A．花盆下躲藏的一群鼠妇

B．丛林中摘果子的狒狒群

C．水中嬉戏的鸭群

D．啃食桑叶的一群家蚕