【新编英语教程】（第一册）Unit4 资源(4/6)
注意首字母的大小写，不含标点符号____1___, wood, and coal. There fuels have been formed over many centuries from plants. People burn them to produce heat and to create power for machines. ___2____, too. And electricity produces light, heat, and sound energy. ___3___, electric power operates many kinds of equipment, tools, and machines, ___4____.http://t1.g.hjfile.cn/listen/201301/201301080831321715034.mp3There is also solar energy in oil
Coal and oil are used to produce electrical energy
In addition
which make work easier
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