According to this passage, the status of the aged is lowered by their ______.

A．forced retirement

B．inferior housing

C．longer life span

D．fixed incomes

下列有关肾损伤手术后的护理正确的是()

A．麻醉作用消失且血压平稳者，可取半卧位

B．观察术后排尿的时间、尿量及颜色

C．伤口的敷料浸湿后应立即更换

D．术后即可进食

E．术后常规安置尿管