I suddenly heard an elephant crying as though frightened Looking down I immediately recognized that something was wrong and ran down to the edge of the near bank There I saw Ma Shwe with her three-month-old calf struggling in the fast-rising water and it was a life-and-death struggle Her calf was floating and screaming with fear Ma Shwe was as near to the far bank as she could get, holding her whole body against the rushing water and keeping the calf pressed against her huge body . Every now and then the rushing water would sweep the calf a way.
There was a sudden rise in the water and the calf was washed clean over the mother’s body and was gone Ma Shwe turned quickly to reach it and pressed the calf with her head and trunk（象鼻）against the rocky bank Then with a huge effort she picked it up in her trunk and tried until she was able to place it on a narrow shelf of rock
Just at this moment she fell back into the river If she were carried down it would be certain death I knew as well as she did ,that there was one spot（地点）where she could get up the bank but it was on the other side from where she had put her calf
While I was wondering what I could do next I heard the sound of a mother’s love Ma Shwe had crossed the river and got up the bank and was making her way back as fast as she could roaring（吼叫）all the time but to her calf it was music.
56．The moment the author got down to the river bank he saw______.
A．the calf was about to fall into the river
B．Ma Shwe was placing the calf on the rock
C．the calf was washed away by the rising water
D．Ma Shwe was holding the calf against the rushing water
57．How did Ma Shwe manage to save her calf from the fast-flowing water?
A．By putting it on a safe spot
B．By pressing it against her body
C．By taking it away with her
D．By carrying it on her back
58．How did the calf feel about the mother elephant’s roaring?
A．It was a great comfort B．It was a sign of danger
C．It was a call for help D．It was a musical note
59．What can be the best title for the text?
A．A Mother’s Love B．A Brave Act
C．A Deadly River D．A Matter of Life and Death
、小球通过P点时的速度大小v和当地的重力加速度值g这四个未知量中，利用上述已知量和图中信息( )
