题目

Despite the fact that it has never been seen almost everyone is familiar with the legendary unicorn（独角兽）. Descriptions of unicorns have been found dating from ancient times. The great philosopher Aristotle theorized that there were two types of unicorn--- the so-called Indian Ass and the Oryx, a kind of antelope. Unicorns are often used in the logo of a noble family, town council or university as their special sign. Even Scotland is represented by a unicorn.        According to the legend, anyone attempting to catch a unicorn had to be extremely cautious as it has a reputation 原点的坐标是：_________，x轴上点的坐标的特点是：________，y轴上点的坐标的特点是：________．