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【单选题】
反复肺部感染造成肺气肿的主要机制是A.
使α1抗胰蛋白酶的活性降低
B.
破坏小支气管壁软骨而失去支架作用
C.
使细支气管管腔狭窄而形成不完全阻塞
D.
肺组织供血减少致营养障碍而使肺泡壁弹性减退
E.
使白细胞和巨噬细胞释放的蛋白分解酶增加而形成肺大泡
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【单选题】2) what is opposite to labor according to paragraph two in Text A ?
A.
work
B.
career
C.
play
D.
game
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