完成故事。
Long long ago, there ____ a king. He ____ new clothes very much. There ____ two ____. They can make magic clothes. ____ people can see it. But foolish people can't. The king ____ through the city with new clothes. A lot of people looked at him and ____. A little boy ____ at the king and ____ "Ha! Ha! The king isn't ____ clothes!"
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=1的焦点到渐近线的距离为( )
