In fact fuels we burn and plant food we eat ______ their chemical energy in the form of heat.A.give inB.give offC.give awayD.give up
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B解析试题分析：考查动词短语：A. give in屈服，让步，B. give off 散发，C. give away赠送，泄露，D. give up放弃，句意：事实上，我们烧的燃料和种的食物，以热量的释放它们的化学能量。选B。
考点：考查动词辨析