题目

As far back as he could remember，Larry had longed to go to Hollywood and become a film star. The young man’s hopes for success were broken again and again, however. Hollywood just did not seem interesting. When he first came to California, Larry had decided never to give up and return home without success. Therefore, he kept on trying. Someday, he told himself, his big opportunity would come. Larry found a job parking cars for one of Hollywood’s big restaurants. His pay was basic, but since the guests were kind enough to give him more money, he managed to make a living. One day he recogn（本小题12分）已知抛物线C：过点A （1）求抛物线C 的方程； （2）直线过定点，斜率为，当取何值时，直线与抛物线C只有一个公共点。