题目

I close my eyes and can still hear her—the little girl with a ___1___ so strong and powerful we could hear her halfway down the block. She was a(n)  ___2___ peasant who asked for money and ___3___ gave the only thing she had——her voice. I paused outside a small shop and listened. She brought to my mind the ___4___ of Little Orphan Annie. I could not understand the words she  ___5___, but her voice begged for ___6___. It stood out from the noises of Arbat Street, pure and impressive, like the chime of a bell. She sang ___7___ an old-style lamp post in the shadow of a building, her arms 函数f（x）（x∈R）满足：对一切x∈R都有f（x）≥0且f（x+1）=7-f2(x)，当x∈[0，1）时，f（x）=x+2(0≤x＜5-2)5(5-2≤x＜1)，则f（2013-3）=（　　） A、223-3B、2-3C、2D、2+3