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卡拉OK歌厅的装修材料使用了许多吸音材料，如泡沫、海绵等。它们燃烧后会产生大量的浓烟。下列有关说法错误的是

A．泡沫、海绵是可燃物 B．泡沫、海绵的着火点很高

C．燃烧的浓烟中含大量有毒气体 D．着火时尽快用湿布捂住口鼻，跑向安全处