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One day， a student asked his teacher， "What is greed？" The teacher didn't answer his question（1）　　， 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 （2）　　： 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（3）　　 chocolate bar． This one was a little bigger． But （4）　　， 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 （5）　　 of them were as large as the earlier ones． He started to regret his decision to keep going． Finally， he （6）　　． He went back to his teacher empty﹣handed and explained what had happened．

    The teacher told him． "You liked the （7）　　 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．"