2. 外语
  3. Every chemical change either results from energy being used to produce the change, or causes energy to be______in some form.

Every chemical change either results from energy being used to produce the change, or causes energy to be______in some form.

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问题 Every chemical change either results from energy being used to produce the change, or causes energy to be______in some form.
选项 A、given off
B、put out
C、set off
D、used up
答案A
解析 give off“散发出，释放出(蒸气、光、烟等没有形体的东西)”，如：give off asweet fragrance(unpleasant smell，odor，smoke and steam，vapor)“散发出香味(难闻的气味、臭味、烟和汽、蒸气)”。put out“放出；出版，生产；熄灭(火)”等，如：The boy put his tongue out for the doctor．“男孩把舌头伸出来给医生看。”set off：“出发；使爆炸”，如：The mischievous boy set off a firework just behind the old gentle—man．“顽皮的孩子们就在那位老先生的背后放了个爆竹。”use up：“用完，耗尽”，如：By that time，he had used up all his savings．“到那时他已经花完他所有的积蓄。”无论从词组的本身含义还是从句子的语义环境来看，都应该选given off。题句意：“每个化学变化要么是能产生变化的结果，要么是能以某种形式得以释放。”
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