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 A项given off意为“释放，放出”；B项put out意为“扑灭；生产”；C项 set off意为“动身；开始”；D项used up意为“用光，用完”。
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