--- What’s Joan doing?

--- ________ newspapers in the room.

A．She reading

B．She reads

C．To read

D．Reading

抢救大咯血窒息最关键的措施是（）

A.立即进行人工呼吸

B.立即使用呼吸中枢兴奋剂

C.立即给予鼻导管吸氧

D.立即采取解除呼吸道梗阻的措施

E.立即输液、输血、注射止血剂