四六級考試網(wǎng)免費發(fā)布2015年12月英語六級真題答案：長篇閱讀（網(wǎng)友版套），更多2015年12月英語六級真題答案相關(guān)信息請訪問大學(xué)英語四六級考試網(wǎng)。

C 46. Not only moving objects and people but all systems have momentum.
　　I 47. Changing the current energy system requires the systematic training of professionals and skilled labor.
　　E48. Changing a light bulb is easier than changing the fixture housing it.
　　K49. Efforts to accelerate the current energy transitions didn’t succeed as expected.
　　G 50. To change the light source is costly because you have to change the whole fixture.
　　A 51. Energy systems, like an aircraft carrier set in motion, have huge momentum.
　　G 52. The problem with lighting, if it arises, often doesn’t lie in light sources but in their applications.
　　J 53. The biggest obstacle to energy transition is that the present energy system is too expensive to replace.
　　D 54. The application of a technology can impact areas beyond itself.
　　B 55. Physical characteristics of moving objects help explain the dynamics of energy systems.

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