(2013·哈尔滨四校高三一模)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：选B 考查动词短语辨析。句意：事实上我们烧的燃料和食用的植物性食物都是以热量的形式释放出它们所含有的化学能。根据句意可知应选give off，表示“放出，发出”。