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Compared to other substances in the Earth system, air is considered ________ conductor of energy. A) an excellent B) a better than average C) an average D) a poorer than average E) a very poor

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 Compared to other substances in the Earth system, air is considered ________ conductor of energy.
A) an excellent
B) a better than average
C) an average
D) a poorer than average
E) a very poor

 
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