On a hike through the bush, he came across a young bull elephant standing with one leg raised in the air.
The elephant    1    distressed (痛苦的), so Peter approached it very   2   .
     He got down on one knee, examined the elephant's    3   and found a large piece of wood deeply embedded
(刺入) in     4  . As carefully and as gently as he   5   , Peter worked the wood out with his hunting knife,    6   
which the elephant gingerly put down its foot. The elephant    7    to face the man, and with a rather curious
look on its face,    8    at him for several tense moments. Peter stood    9  , thinking of nothing else but being
killed.   10   the elephant trumpeted (高声鸣叫) loudly, turned, and walked away. Peter never forgot that
elephant or the events of that day.   
     Twenty years  11 , Peter was walking through the Chicago Zoo with his teenaged son. As   12   approached
the elephant enclosure (围栏), one of the creatures turned and walked over to near   13   Peter and his son
Cameron were   14  . The large bull elephant stared at Peter, lifted its front foot off the   15  , then put it down.
The elephant did that several times then trumpeted loudly,   16    staring at the man.
     Remembering the accidental meeting in 1986, Peter could not help  17  if this was the same elephant. Peter 
 18   his courage, climbed over the railing, and made his way into the enclosure. He walked  19   up to the
elephant and stared back in wonder. The elephant   20   again, wrapped its trunk around one of Peter's legs
and threw this stupid ass hard against the railing, killing him immediately.
     Probably it wasn't the same elephant.