One day, a student asked his teacher, "what is greed?" The teacher didn't answer his question____ , but asked the student to walk through the chocolate factory next to their school and pick out the biggest chocolate bar（条、块） he could find．But there was a ____: as he passed through the factory, he could not turn back.

    The student went to the chocolate factory. As he walked, he saw a large chocolate bar. He liked it, but thought he might be able to find an even bigger one if he kept going. He kept walking and saw ____ chocolate bar. This one was a little bigger. But ____, he thought he could find an even bigger one if he kept going. As he neared the end of the factory, he saw fewer chocolate bars, and ____ of them were as large as the earlier ones. He started to regret his decision to keep going. Finally, he ____. He went back to his teacher empty-handed and explained what had happened.

    The teacher told him, "You liked the ____chocolate bar, but you kept looking for a bigger one. And later, you realized that you had given up the best chocolate bar because you thought you could do better. That is called greed."

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.

符号是“－”号，绝对值是8的数是（    ）