科举制度在我国存在的时间是（    ）

阅读课外文章《春雨的色彩》，回答问题。

       春雨，像春姑娘纺出的线，没完没了地下到地上，沙沙沙，沙沙沙……

      一群小鸟在屋檐下躲雨，他们在争论一个有趣的问题：春雨到底是什么颜色的？

      小白鸽说：“春雨是无色的，你们伸手接几滴瞧瞧吧。”

      小燕子说：“不对，春雨是绿色的。你们瞧，春雨落在草地上，草地绿了，春雨淋在柳树上，柳树绿了。”……”

      麻雀说：“不，不！春雨是红色的。你们瞧，春雨洒在桃树上，桃花红了。春雨滴在杏树上，杏花红了。”

      小黄莺说：“不对，不对，春雨是黄色的。不是吗？它落在油菜地里，油菜花黄了，它落在蒲公英上，蒲公英的花也黄了。”

      ​春雨听了大家的争论，下得更欢了，沙沙沙，沙沙沙，它好像在说：“亲爱的小鸟们，你们的话都对，但都没说全面。我本身是无色的，但我给春天的大地万紫千红。”

    Do you know the boy in the picture? He is Yi Yangqianxi. His English name is Jackson. Yi is 15 years old. He is a student in a school in Beijing. And he is also a boy in the group (组合) TFBOYS.

    TFBOYS has three boys — Wang Yuan, Wang Junkai and Yi Yangqianxi. All of them are tall and have good looks. They are good at dancing and singing.

    Wang Yuan and Wang Junkai are Yi's friends. And Yi has another (另一个) friend. He is a toy bear. He lives in Yi's schoolbag. Yi goes to school with him every day. He talks and plays with him. “He can't talk, but he can listen to me. He is very nice. I like him very much,” Yi says. “I don't want to be away from him.”