返回 【新编英语教程】(第一册)Unit4 资源(4/6)

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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____.

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