题目

Neil seemed very calm, yet Celia was still aware of his panic _______ the surface. A . beneath B . over C . beyond D . from 答案：A已知圆C：x2＋y2＋6x＋8y＋21＝0，抛物线y2＝8x的准线为l，设抛物线上任意一点P到直线l的距离为m，则m＋|PC|的最小值为________．