I know that electricity into our flat through thin wires.

    If we try to think of the most important inventions in the 20th century, I think electricity may(is) the most important, in a way. It plays important part in the development(发展) of the modern world. It can affect(影响) everyone's life. When the electricity (go) off, we call it a power cut. Can you imagine what (we) life will be like(with) electricity?

    Almost everything will stop. Electrical appliances(电器) can't work, traffic lights are dead, many workers must stop(work)and so on. Electricity is so(importance), it is also limited.

    should we do? At least(至少)，we(must)waste electricity.

    Electricity is all around us. It's in the computer you are using, it's in the ground under your feet, and it's in your body. And you can't live without electricity.

    Without electricity, you wouldn't be reading this article right now. It's not because it's not bright enough without electricity. It's because your brain wouldn't work.

    Every move of your body needs the help of electricity. The nervous system(神经系统）sends electrical signals（信号）to your brain first, and then your brain sends them to your body. These signals don't flow along a wire. They jump from one cell（细胞）to the next until they get to their final place.

    With so much electricity jumping around, it may seem like the body is a great power station. You may wonder if you have enough power to turn on TV. Well, your body can just create little electricity. So stop dreaming.