发挥自己的潜能，实现自已的理想与抱负的需要是（）
A.生理需要
B.安全需要
C.爱与被爱的需要
D.尊重的需要
E.自我实现的需要
参考答案：E
PaO2下降，PaCO2变动不大，见于（）
A．呼吸中枢抑制
B．肺顺应性降低
C．胸廓顺应性增加
D．慢性阻塞性肺疾患
E．肺广泛纤维化病变
It was not until fish ____ that the villagers realized the importance of protecting the river. [ ]
A. died away
B. died off
C. died from
D. died out
