腺样体肥大合并分泌性中耳炎，治疗原则是（）
A.改善中耳通气
B.清除中耳积液
C.病因治疗
D.恢复患耳听力
E.上述都不是
参考答案：C
------Does Tom have a brother?
-------Yes, she .[ ]
A has
B do
C does
D have
低渗性缺水?
