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Q. |
………….differentiates between five stages of human development: In the first, people use energy of their own muscles.In the second, they use energy of domesticated animals’.In the third; they use the energy of plants (agricultural revolution). In the fourth, they learn to use theenergy of natural resources: coal, oil, gas. In the fifth, they harness nuclear energy. |
A. | Eric S. Raymond |
B. | George B.Selden |
C. | Leslie White |
D. | Richard Stallman |
Answer» C. Leslie White |
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