单选题
Which of the following does NOT show the process of evolution of leapfrog technology?
A、
(A) from fixed line network to mobile phone
B、
(B) from light-emitting diodes to incandescent light bulbs
C、
(C) from centralized electric grids to green sources
D、
(D) from desktop computers to portable devices
【正确答案】
B
【答案解析】
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