患者呼吸时发生吹哨声应考虑患有（）。
A.慢性鼻炎
B.鼻中隔血肿
C.鼻中隔前段小穿孔
D.鼻中隔大穿孔
E.鼻中隔后段小穿孔
参考答案：C
When he was alive, the old scientist used to say that knowledge ______ from practice and he gained his experience by doing a lot of practical work.
A．was coming
B．had come
C．comes
D．would come
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