A. electromagnetic energy B. electromagnetic energy travels through space C. came from the sun D. when a change in the nucleus o

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问题 A. electromagnetic energy
B. electromagnetic energy travels through space
C. came from the sun
D. when a change in the nucleus of an atom takes place
E. when the sunrays are fierce
F. chemical energy is generated
______ when electron rearrangement takes place.

选项

答案F

解析 第五段的第五句指出,化学能来自于电子重组。F项中的“Chemical energy is generated(化学能生成)”与原句意思相符,故选F。
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