外界氧气通过哪些途径进入肺泡?
参考答案：
外界氧气通过鼻、咽、喉、管、左右主支气管、肺内各级支气管最后进入肺泡。
Mary, don't eat ____________ meat，you'll get fat.[ ]
A. too many
B. too much
C. much too
D. many too
腰围
