题目

过抛物线的焦点作斜率为的直线，与抛物线在第一象限内交于点，若，则（ ）A. 4 B. 2 C. 1 D. 答案：【答案】B【解析】设A，根据抛物线的定义知，又 ，联立即可求出p.设A，根据抛物线的定义知,又 ，联立解得，故选B.When I opened the door, I found my father sitting in his chair, completely ________ in the humorous stories he was reading．A.absorbedB.losingC.attractedD.busy