营养不良时各系统功能特点包括下列()

A．消化液和酶的分泌减少，消化吸收功能差

B．免疫功能低下，易患各种感染性疾病

C．心肌收缩力下降，心搏出量降低

D．肾功能减退，尿量减少

E．常表情淡漠，精神抑郁，反应迟钝

While managing the separation anxiety during hospitalization for a two-year-old boy, which of the following suggestions would be most helpful to the parents()

A. Tell the child the time they are leaving and returning.

B. Bring the child’s favorite toys from home.

C. Leave while the child is sleeping.

D. Keep the visit time short.