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Coal was formed out of dead forests by ...

 Coal was formed out of dead forests by chemical ______ .

A. produce              B. processes                C. product      D. Progress

 

B 【解析】考查单词,produce 生产,制造;processes 经过,过程(自然的)作用 product 自然的产物,人工的制品 progress 进步 根据句意煤的形成是化学变化的过程故选B.
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