The prices of houses, ____________ is often reported, have been going up sharply in the past few months.

A．which

B．it

C．as

D．what

外科护理学发展经历了哪3个主要阶段()

A．以护理技术为中心

B．以患者为中心

C．以护理理论为中心

D．以疾病为中心

E．以人的健康为中心