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

 

B

【解析】B　考查動(dòng)詞短語(yǔ)。句意：事實(shí)上我們燒的燃料和食用的植物性食物都以熱量的形式放出它們所含有的化學(xué)能量。根據(jù)句意可知應(yīng)選give off，表示“放出，發(fā)出”。

 

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