从下述答案中，选出三种用呼气相X线片诊断时有重要价值的疾病（）
A.肺炎
B.支气管异物
C.肺气肿
D.细支气管炎
E.胸膜炎
参考答案：B, C, D
________ you don’t give up, your dreams will come true.
A．As long as
B．As soon as
C．As well as
D．As quickly as
聚落的概念，城市定义、城市与乡村主要差异。
