1. Ever since early the last century, electricity has become an essential part of our modem life. ______________ 2. If there were no electric power,_______________ 3. Therefore,____________

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写作指导 这是一篇给出了各段首句的议论文，要求对每句——即各段的主题句进行适当展开论述。议论文通常由论点，......

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