题目

These days, people who do manual (体力的) work often receive far more money than people who work in offices. People who work in offices are frequently referred to as “white-collar workers” for the simple reason that they usually wear a collar and tie to go to work. Such is human nature, that a great many people are often willing to sacrifice higher pay for the honor of becoming white-collar workers. This can lead to curious situations, as it did in the case of Alfred Bloggs who worked as a dustman for the Ellesmere Corporation.When he got married, Alf was too embarrassed to say anythingF是抛物线的焦点，P是抛物线在x轴上方的点，若|PF|=5，则点P的坐标是 [　　]