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 动词词组辨析。given off“释放”；put out“伸出；出版；扑灭”；set off“出发，动身；开始，引起”；used up“筋疲力尽，枯竭”。根据句中chemical change提供的信息，可知化学变化只能是以某种形式energy的“释放”。故答案为A。
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