2. 外语
  3. A. electromagnetic energy B. electromagnetic energy travels through space C. came from the sun D. when a change in t

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

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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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