2015年12月六级答案：第一套长篇阅读理解（网友版）
视频解析 视频解析 2015年12月19日的大学英语四六级考试正式拉开序幕，新东方网四六级频道第一时间为广大考生带来四六级考试真题答案以及解析，届时新东方多位知名教师也将第一时间对此次四六级考试相关真题做出详细解析，敬请广大考生密切关注以及。
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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