题目

By improving the electric light bulb, Thomas Edison made it possible for homes or individual houses to be electrified at a time when almost everybody was ____________, since electric light was also a much safer form of illumination than gas or candles or oil lamps.A. using keroseneB. using coalC. using gasD. using charcoal

By improving the electric light bulb, Thomas Edison made it possible for homes or individual houses to be electrified at a time when almost everybody was ____________, since electric light was also a much safer form of illumination than gas or candles or oil lamps.

A. using kerosene

B. using coal

C. using gas

D. using charcoal

题目解答

答案

C. using gas