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
Edison’s bright invention is likely to be outdated because ______.
选项
答案A
解析 依据是第一段的第一、二句。
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