下列各项中可引起混合性呼吸困难的是
A．气管异物B．白喉C．大面积肺梗死D．支气管哮喘E．慢性阻塞性肺气肿
参考答案：C
We have two rooms but I can’t decide .
A．to live;choose which one
B．lived;choose which one
C．to live in;which one to choose
D．live;which one
出血的危险信号？
