题目内容：
Which of the following statements is TRUE according to the passage?
A．Thin people sit fewer hours daily than heavy people． B．People deliver messages to their colleagues in person．
C．More people walk around when they talk on the phone．
D．Heavy people make longer phone calls than thin people．
参考答案：【答案仅供学习，请勿对照自行用药等】
答案解析：