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简介：
【一】
We celebrated Earth Day in my city last week. The idea of this special day began in the 1960 when life was very different. Few people talked, or even thought, about the environment. Most people had no idea how dirty our air and water were. This worried Gaylord Nelson, who was a senator (参议员) in the US government, and he had an idea. If people around the world knew the Earth was in danger, they might work harder to save it, so he just needed to get their attention (注意). The first Earth Day was just in the United States, but it led to events every year all around the world on April 22 or the nearest weekend depending on where you are.
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