[解析]
Then Kelly began her training for the try out,keeping it a secret from her mom.Ballet was the Kelly way of life,so only her sister knew about boxing,and her mother would have stopped it.Because boxing didn't come naturally to Kelly,she just came to love it,so she often got knocked down during training and suffered.【高分句型一】Now that you've made a choice,you can't give up.She has an unyielding spirit and must participate in the qualifiers.(凯利开始拳击训练,并吃了很多苦,但没有放弃)
The following Monday,results of the boxing tryout were posted.Kelly was afraid to look at the published list for fear of losing out.Then a woman tapped her on the shoulder and told her she had been chosen.The voice sounded familiar to her.It was her mother.Her sister stood by smiling.Before she knew it,her mother told her she had known she had been boxing.【高分句型二】Her mother very much support her.Now through the qualifiers,the family happily went home to celebrate.This really echoes the saying."Interest is the best teacher".(凯利通过了预选赛,同时得到了妈妈的支持)