2. 外语
  3. A. traditional lighting is less durable and dearer B. a laser excited the quantum dots C. America adopted LEDS D. gr

A. traditional lighting is less durable and dearer B. a laser excited the quantum dots C. America adopted LEDS D. gr

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问题     A. traditional lighting is less durable and dearer
    B. a laser excited the quantum dots
    C. America adopted LEDS
    D. graduate students work hard
    E. quantum dot mixtures are magic
    F. it is more efficient
Something unexpected happened during Bower’s experiment when ______.
选项
答案B
解析 与题干有关的内容在第三段第二、三句中可以找到。根据这两句表达的意思，B是正确答案。
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