Wood,crop residues,and ________ still remain the main sources of heat for one-third of the world's people.

Name: Wood,crop residues,and ________ still remain the main sources of heat for one-third of the world's people.
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Question

Quizplus · Accepted Answer

The sentence specifically mentions "dried dung" as one of the main sources of heat for one-third of the world's people, thus we can determine that dried dung is the best choice. Coal, natural gas, and petroleum are not mentioned in the sentence.

Wood,crop Residues,and ________ Still Remain the Main Sources of Heat