问题
选择题
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
答案
答案：B
题目分析：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。