题目

 It comes as ______ surprise that ______ dream of space travel will soon come true.     A. a; the           B. the; the           C. the; a           D. a; 不填 答案：A20．设过原点的直线1与抛物线y2=4（x-1）交于A，B两点，且以圆恰好过抛物线焦点F，求：（1）直线1的方程（2）|AB|的长．