在Unix/Linux系统中，文件类型为“b”，说明这是一个（）。A、二进制可执行文

     Once upon a time, there was a large mountainside, where an eagle's nest rested. The eagle's nest
contained four   1    eagle eggs. One day an earthquake rocked (使震动) the mountain   2    one of the
eggs to roll down the mountain,    3    a chicken farm, which was in the valley below. The chickens knew
that they must    4    and care for the eagle’s egg, so an old hen (母鸡)   5    to hatch (孵) and raise the
large egg.       
     One day, the egg hatched and a beautiful eagle was born.    6   , however, the eagle was raised to be
a(n)    7   . Soon, the eagle believed he was   8    more than a chicken. The eagle loved his home and
family,   9    his spirit cried out for more. While playing a game on the farm one day, the eagle looked to
the skies
above and     10    a group of eagles soaring in the skies. "Oh," the eagle    11  , "I wish I could soar like
those birds." The chickens shouted with   12   , "You cannot soar with those birds. You are a chicken and
chickens do not soar."     
     The eagle    13    staring at his real family up above,    14   that he could be with them. Each time the
eagle would let his    15    be known, he was told it couldn’t be done. That is    16    the eagle learned to
believe. Slowly, the eagle    17   dreaming and continued to live his life like a chicken.   18   , after a long
life as a chicken, the eagle    19   .       
     You become what you believe you are; so if you ever dream to become an eagle,   20   your dreams,
not the words of a chicken.