题目

已知抛物线y=x2和三个点M（x1,y0）、P（0，y0）(y0≠x20,y0＞0),过点M的一条直线交抛物线于A、B两点，AP、BP的延长线分别交抛物线于点E、F. （1）证明E、F、N三点共线; （2）如果A、B、N四点共线，问：是否存在y0，使以线段AB为直径的圆与抛物线有异于A、B的交点？如果存在，求出y0的取值范围，并求出该交点到直线AB的距离；若不存在，请说明理由. Have you heard of Zhou Yang? She is now well known ______ an excellent short track speed skater (短道速滑运动员). Zhou Yang is not an overnight ______. She was born in a poor family in Changchun on June 9th, 1991 and started ______ at the age of 8. She fell in love with the ______ at once when she put on her skate to train for the first time. Soon her talent (天赋) for short track speed skating was ______. Zhou Yang trained hard and made her way into the national team ______.In the world championships (锦标赛) in 2008, Zhou Yang set a world record in the 1,500m event. Zhou Yang proved (证明) ______ again in the 2010 Winter Olympics. Her performance gave China the ______ gold medal in the women’s 1,500 meters in the Winter Olympics—China had never won the event before.“Winning the event is my dream, ______ I still have one more dream, winning the relay (接力赛),” Zhou Yang said.Her “one more dream”______ when she and her teammates won the women’s 3,000m short track relay with a new world record.【1】A. asB. likeC. forD. with【2】A. problemB. fanC. successD. prize【3】A. skiingB. swimmingC. runningD. skating【4】A. seasonB. sportC. movieD. book【5】A. noticedB. refusedC. receivedD. forgotten【6】A. some timesB. as wellC. at firstD. at last【7】A. herB. herselfC. hersD. himself【8】A. firstB. secondC. thirdD. last【9】A. soB. butC. orD. if【10】A. saw offB. grew upC. came trueD. ran away