Scientists realized the importance of electricity since the day it was discovered. Unfortunately,electricity was not available in nature for direct use.Scientists had to come up with ways of producing it.Here again,the heat engine was used to produce mechanical energy,which in turn can produce electricity.Today,many power-producing stations all over the world still use heat engines.They use coal or fuel oil to evaporate water,then the steam is used to turn a turbine which can produce electricity.

　　In conclusion,heat engines proved to be one of the most important inventions.It is enough to observe the importance of industry,transportation,and electricity in our lives to know the importance of heat engines.Although the engines used today are quite different from the early ones,the same concept of changing heat into other kinds of energy is still used.

　　1.What is the passage mainly about?()

　　A.The importance of electricity.

　　B.The importance of heat energy.

　　C.The importance of the heat engine.

　　D.The importance of means of transportation.

　　2.The underlined word “transforms” in Para.1 can be best replaced by 　. 

　　A.changes B.divides

　　C.adapts D.breaks

　　3.Which of the following is TRUE after the scientist used heat engine in industry?()

　　A.Heat engines greatly promoted industry.

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