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[单选,材料题] According to the third paragraph,what will happen when the underground heat does not dis—ap

根据以下资料,回答下面的题目。


According to the first paragraph,one or the warnings given by the scientists is that   

A . Coal heats up on its Own and catches fire and burns.
B . The underground oxygen will be used up.
C . Poisonous fumes and greenhouse gases wm be accumulated anderground.
D . There will be an increase of abandoned mines.

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