In fact fuels we burn and plant food we eat their chemical energy in the form of heat.
A. give in
B. give off
C. give away
D. give up
网友回答
A. give in
(答案→)B. give off
C. give away
D. give up
解析：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。