题目

One day, a boy fought with one of his classmates.    46   “He is really bad and I hate him.”  the boy said.     The grandfather said, “Let me tell you a story. When I was a boy, I too, sometimes hated others for what they did.   47   It doesn’t hurt（伤害） your enemy (敌人) but only hurt yourself. ”     As the boy listened carefully, the grandfather went on, “There are always two tigers inside my heart. One is good and kind. He gets on well with everything around him.   48    He is full of anger （怒气）. Even the smallest thing will make him（2012?沛县模拟）一个养殖场，养鸭的只数比养鸡的只数少20%，养的鸡比鸭多1000只．这个养殖场养鸭多少只？