单选题
Every chemical change either results from energy being used to produce the change, or causes energy to be ______ in some form.
A、
given off
B、
put out
C、
set off .
D、
used up
【正确答案】
A
【答案解析】
[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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