可引起不均匀的气流阻力，影响吸入气体分布的是
A．肺水肿
B．间质性肺炎
C．肺气肿
D．支气管痉挛
E．肺纤维化
参考答案：D
—Sorry, I'm late.
—It's OK. However, you________come to the company today, for it is Saturday. [ ]
A. couldn't have
B. needn't have
C. wouldn't
D. couldn't
