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【单选题】
最近冰岛南部的法拉火山于2010年3月至4月接连两次爆发，火山灰对航空运输、气候和人体健康均产生长期影响．下列关于火山灰对人体危害的说法正确的是（　　）
A.
火山灰有放射性，会损伤呼吸器官
B.
火山灰温度高，会灼伤呼吸器官
C.
火山灰带有大量病毒和细菌，易使人体生病
D.
火山灰进入肺后，在湿润的环境下形成类似水泥的物质，影响肺的功能
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