气管向患侧移位，可见于（）
A．胸腔积液
B．气胸
C．肺气肿
D．肺不张
E．肺实变
参考答案：D
城市是人民防空的重点，国家对城市实行( )。
A．分级防护B．分类防护C．重点防护D．定向防护
They had all the best bands ______ their______ music.[ ]
A. played , later
B. play, later
C. playing, latest
