题目

已知一次函数y=kx+b经过（﹣1，2），且与y轴交点的纵坐标为4，则它的解析式为． 答案：【1】y=2x+4 My First Marathon (马拉松)A month before my first marathon, one of my ankles was hurt and this meant not running for two weeks, leaving me only two weeks to train. Yet, I decided to go ahead. I remember back to my 7th year in school. After my first PE class, the teacher told me that I was "not athletic (运动型的)". The idea that I was "not athletic" stuck with me for years. When I started running in my 30s, I realized running was a fight against myself, not about competition or whether or not I was athletic. It was all about the fight against my own body and mind. A test of wills!The night before my marathon, I dreamed that I couldn't even find the finish line. I woke up, being helpless and nervous but ready to prove something to myself. Shortly after crossing the start line, my shoe lace became untied. So I stopped to tie it. Not the start I wanted! I had been left behind others at the beginning. At mile 3, I passed a sign: "GO FOR IT, RUNNERS!"By mile 17, I became out of breath and the once-hurt-ankle hurt badly, but I still stayed the course, walking a bit and then running again. As I came near to mile 23, I could see my wife waving a sign. She is my biggest fan. She never minded the alarm clock sounding at 4 a. m. or questioned my expenses on running. I was one of the final runners to finish. But I finished! And I got a medal. In fact, I got the same medal as the one that the person who came in first place had. I can now call myself a "marathon winner".1.What happened to the writer a month before his marathon?A.He hurt his knees. B.He got hurt in one ankle.C.He wanted to give up. D.He went back to his school.2.According to the PE teacher in the 7th year in school, the writer________.A.didn't train hard B.could finish the marathonC.wasn't good at sports D.would get support from many fans3.What does the story mainly tell us?A.One is never too old to learn.B.Failure is the mother of success.C.A man can make success with the help of family.D.A winner is the one with great effort and a strong will.