呼吸衰竭是各种原因引起的肺（）和（）功能严重障碍，导致（）和（），从而引起一系列生理功能和代谢功能紊乱的临床综合征。
参考答案：通气；换气；缺氧；二氧化碳潴留
Passeagers are permitted only one piece of hand luggage onto the plane.
A．to carry
B．carrying
C．to be carried
D．being carried
It suddenly_____ to me that I could use a computer to do the job.
A．erupted
B．caused
C．occurred
D．happened
