—Though it         in the desert most of the year, people still live there.

—That’s the case. They say east or west home is the best.

A．hasn’t rained

B．didn’t rain

C．doesn’t rain

D．hadn’t rained

女性患者，42岁，肺心病，因输液引起肺水肿，经吸氧后症状好转，予以停氧，停氧时护士首先应

A．关流量表

B．取下湿化瓶

C．关总开关

D．拔出鼻导管

E．拔出导管的玻璃接管