One of the most important questions they had to consider was _____ of public health. [ ]

A. what

B. this

C. that

D. which

儿童在住院治疗之后，最先出现的心理反应是（）。

A.焦虑心理

B.反抗心理

C.悲观心理

D.恐惧心理

E.孤独心理