诊断急性脓胸最可靠的依据，是（）
A.X线所见胸部致密影
B.高热，胸痛
C.白细胞升高
D.胸穿抽出脓液
E.抗生素治疗有效
参考答案：D
北京历史悠久，名胜古迹众多，下列名胜古迹不属于北京的是[ ]
A．十三陵、颐和园
B．天坛、颐和园
C．周口店猿人遗址、长城
D．兵马俑、华清池
()divorce is often the only satisfactory solution for married couples who can no longer stand the sight of each other, it can have a shocking effect on their kids.
A. Since
B. While
C. As
D. Unless
