题目

已知抛物线C : y2 ＝2 px（p＞ 0），其焦点为F，O为坐标原点，直线 AB（不垂直于x轴） 过点F 且抛物线C交于 A，B两点，直线OA与OB的斜率之积为－p ． （1）求抛物线C 的方程； （2）若M 为线段AB 的中点，射线OM 交抛物线C 于点 D ，求证：＞2 答案：听一段材料，完成对话1-4小题。1. What are they talking about? [     ]A. A picnic.B. Healthy food. C. Drinks.2. What's the woman's favorite drink? [     ] A. Orange juice. B. Cola. C. Soda.3. What else do they need? [     ]A. Crisps. B. Bread. C. Fruit. 4. What are they doing while talking? [     ]A. They are having supper. B. They are drinking orange juice. C. They are getting things ready.