2. 考研
  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 本题为短语动词词义辨析题。give off意为"放出，发出"；put out意为"扑灭；生产"；set off意为"出发，开始"；use up意为"用完，耗尽"。根据题意，化学反应不是由某一能量引发就是反应本身引发某一能量的释放，故选项given off为正确答案。
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