下列关于心源性呼吸困难的护理措施不妥的是

A．应安置患者平卧位休息，头偏向一侧

B．稳定情绪，安慰疏导患者

C．根据心功能情况，给予必要的生活护理

D．给予中等流量、中等浓度氧气吸入

E．观察呼吸困难的特点、程度及伴随症状，及时发现心功能变化

--These days I can only sleep for four or five hours at night as I’m too busy with my research work.

--If you keep going on like that, you are sure to ______ sooner or later.

A．break down

B．get down

C．calm down

D．put down