单选题：Chemical energy is generated__________

题目分类：理工类
题目类型：单选题
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题目内容：

Chemical energy is generated__________ A．when it is absorbed by matter
B．when it is cloudy
C．because they can pass through solid objects
D．when the sunrays are fierce
E．when a change in the nucleus of an atom takes place
F．when electron rearrangement takes place

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答案解析：

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