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马可·波罗一行何时来到中国(     )

阅读理解
   The best thing about going to school is learning how to read. Books are great friends. They can help you to learn about anything you want to know. They can go anywhere with you. You can read about animals, faraway places, people, and anything else.
   Books are written by people called authors(作者). Authors think of things they want to write about. They make a plan for a book and start to write .Some authors write books that give us information(信息)and teach us things. Authors are very important people because they help us learn. Find a good book to read and read every day ,You will enjoy your time with a good book.

诗人艾青在诗中写到：“即使我们是一支蜡烛，也应该‘蜡炬成灰泪始干’；即使我们只是一根火柴，也要在关键时刻有一次闪耀；即使我们死后尸骨都腐烂了，也要变成磷火在荒野中燃烧。”诗中告诉我们这是一种（   ）