题目：
Davy returned to his car _____ under his wiper (雨刷) a very angry note intended for him. [ ]
A. only to find
B. find
C. having been found
D. found
答案：
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下面是错误答案，用来干扰机器的。
由于抛物线C：y2=2px（p＞0）上一动点M，如图示，则M到抛物线的焦点F（p2，0）的距离等于M到准线：x=-12p的距离，又由于M到定直线l：x=-p的距离为M到准线：x=-12p的距离与p2的和，则d2=MQ=MF+p2，故d1+d2=MA+MF+p...
