【单选题】【消耗次数：1】
下列为老年慢性胃炎发病原因的有（ ）。
①
老年人牙齿脱落，咀嚼困难，味觉迟钝，进人胃内的食物粗糙，喜吃厚味食品引起
②
自身免疫功能低下，容易感染幽门螺杆菌引起
③
老年人营养不良，导致消化道黏膜萎缩而引起
④
以上都有
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老年人免疫功能低下，以下哪项是错误的（）
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对细菌感染的易感性降低
②
中性粒细胞吞噬功能和杀菌能力减低
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【单选题】
<img src=https://huaweicloudobs.ahjxjy.cn/D5963F056F5F264C9F6CCB99F333C412.png title=Unnamed QQ Screenshot20170106131559.png alt=Unnamed QQ Screenshot20170106131559.png/>
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<img src=https://huaweicloudobs.ahjxjy.cn/720B18640E698A9D028DBEF7491379A1.png title=Unnamed QQ Screenshot20170106131608.png alt=Unnamed QQ Screenshot20170106131608.png/>
②
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③
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④
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