【单选题】【消耗次数：1】
下列关于口呼吸病因学的说法不正确的是（）
①
解剖异常：原发骨性的鼻咽腔气道的狭窄、鼻甲肥大、或者鼻中隔偏曲
②
外伤或骨折：由于瘢痕形成引起气道狭窄
③
异物阻塞
④
呼吸道感染导致腺样体和鼻粘膜组织的肥大或感染性增大
⑤
病理性感染或变态反应：过敏肥大性鼻炎、慢性感染性鼻炎或鼻窦炎，或过敏源性的鼻窦息肉
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