英语脑筋急转弯:Two copies

A young blonde executive was leaving the office one evening when she noticed the CEO standing in front of the shredder with a piece of paper in his hand. "Listen," said the CEO, "this is important, and my assistant has left for the day. Can you make this thing work?" "Certainly," she replies, flattered that the CEO had askedher for help. She turned the machine on, inserted the paper, and pressed the START button. "Excellent!" replied the CEO, "I'll need two copies."