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| Pencils were precious | |
| 作者姓名： | 梁小平 |
| 作者单位： | 中央电大英语教研组 |
| 摘 要： | Many of us still call pencils lead pencils. But we are really badly out of date. Most people stopped using pencils filled with lead about four hundred years ago! Lead is a soft, heavy metal. It makes a grey mark if you rub it on a piece of paper. About the year 1300, men were using thin |
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