1. 自从本世纪初开始，电就一直是现代生活的重要组成部分。
2. 如果没有电力，……
3. 因此，……
      Ever since early this century, electricity tas become an essential part of our life. Modern industrial and agricultural production must rely on it. Modem traffic, communi cation and entertainment as well as our daily life have much to do with it. It can he said that ours is an electric age.
      If there were no electric power, no machines could be run, no living things could survive, no civilization would exist in the world. It’s clear that without electric power living things would be hard to live on the earth.
Therefore, we must go out of our way to exploit waterpower resources and sparingly
use electricity so as to make good use of it in our country.