My mind wasn't on what Mr. Luo was saying, so I'm afraid I ________ half of it.

[      ]

A. was missing

B. had missed

C. will miss

D. missed

符合阻塞性肺气肿的是（）

A.其病理改变是不可逆的

B.仅限于肺泡弹性减退与膨胀

C.经积极治疗可以痊愈

D.α1–抗胰蛋白酶增加易发生肺气肿

E.肺功能改变主要是肺活量减少