2. 外语
  3. 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 fie

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 fie

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问题 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
Chemical energy is generated______.
选项
答案F
解析 借助问题句中的特征词chemical energy作为答案线索词，在第五段倒数第四句找到答案相关句(Chemical energy comes from electron(电子)rearrangement．)，确认答案为F。
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