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One possible versionTh[文]en I wondered whether the man would still be at the same spot. I walked out the doorand back to the street where I had met him. There the man was, at the same spot, knees curledup against his chest, with the same cardboard[章] sign shading his head. I walked down the street,an[来]d before I could think twice, I stood before him. He cautiousl[自]y glanced in my direction[知].Ismiled and held up the lunch bag. "I brought you some lunch, "I saidI handed him the bag, and he looked closely at it. " Thank you for this. I was praying thismorni[嘛]ng, asking for someone,s[答] heart to open. We talked for a little while. As he shared hisstory,[案] there was an, open, honest tone in his voice. There was something[网] about giving thatmade me feel like I was talking with a brother. "I hope you have a nice day, "I told him<"Thank you! It's already gotten a lot better, " he said. As I walked by, his thank fulness hadbecome[文] mind. My day, too, had already gotten a lot better. Anything helps, indeed
13.【答案】25[章]【解析】由题意得直[来]线方程为y=an6[自]0x=5x,即√5[知]x-y=0,由x2[嘛]+y-4y=0,得[答]x2+(y-2)2[案]=4,则圆心为(0[网],2)，半径为2，[文]故答案为：2√5
