天然气是一种易燃易爆的气体。
参考答案：对
双肺满布哮鸣音，呼气相延长（）。
A.支气管扩张症
B.支气管哮喘
C.支气管肺癌
D.慢性支气管炎（喘息型）
E.肺间质纤维化
It ___ recently that self-funding foreign students are becoming the largest overseas group in China.
A．gave out
B．put out
C．figured out
D．turned out
