完形填空，阅读下面短文，掌握其大意．然后从各题所给的A、B、C和D项中，选出最佳选项。

　　Some years ago on a hot summer day in south Florida a little boy decided to go for a swim in the old swimming hole behind his house．In a hurry he dived into the cool water and flew into the water, not 　　1　　 that as he swam toward the middle of the lake, an alligator(美洲鳄)was swimming toward the 　　2　　．His mother, looking out the window in the house, saw the two as they got closer and closer together．In utter(完全的)fear, she ran toward the water, yelling to her son as 　　3　　 as she could．Hearing her voice, the little boy became 　　4　　 and made a return to swim to his mother．It was too late．Just as he reached her, the alligator 　　5　　 him．From the dock(码头), the mother grabbed her little boy by the arms just as the alligator snatched his legs．That began an incredible tug-of-war(拔河)between the two．The alligator was much 　　6　　 than the mother, but the mother was much too passionate to let go．A farmer happened to drive by, heard her screams, raced from his truck, took aim and 　　7　　 the alligator．

　　Remarkably(出乎意外地), after weeks in hospital, the little boy 　　8　　．His legs were 　　9　　 scarred by the attack of the animal and, on his arms, were deep scratches where his mother's fingernails dug into his flesh in her effort to hang on to the son she loved．

　　The newspaper reporter who interviewed the boy later asked if he would show him his 　　10　　．The boy lifted his legs．And then, with obvious 　　11　　 , he said to the reporter, “But look at my arms．I have great scars on my arms, too．I have them because my mom wouldn't let go．”

　　You and I can identify(感同身受)with the 　　12　　．We have scars, too．No, not from an alligator, or anything quite so dramatic．But, the scars of a 　　13　　 past．Some of those scars are unsightly(难看的)and have caused us deep 　　14　　．But, some, my friend, are because God has 　　15　　 to let go．In the midst of your struggle, he's been there holding on to you．

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