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.

E 48. Changing a light bulb is easier than changing the fixture housing it.

K 49. 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.

考后关注：2015年12月英语六级成绩查询　合格分数线　算分器