题目

设点P是双曲线x2－=1上一点，焦点F（2，0），点A（3，2），使|PA|+|PF|有最小值时，则点P的坐标是                  ．                  答案：           ________ is stronger than steel and lighter than a feather is the silk ________ spiders make their webs.          A. That; that    B. Which; for which         C. What; what D. What; with which