SECTION A CONVERSATIONS Directions: In this section you will hear several conversations. Listen to the conversations carefully and then answer the questions that follow. 听力原文：M: One thing you listeners don't know about me is that I used to weigh an incredible three hundred pounds. Ever since I started the Moment of Science Weight Loss Program, though, I've Been slimming and trimming until i'm now in the spectacular shape you see today. W: Don't... you look the same as you always have. M: Well, OK. But I 60 fidget. W: You fidget? What does fidgeting have to do with weight? M: Maybe a lot! Researchers at the Mayo Clinic in Minnesota did some experiments to try to figure out why some people gain weight more than others do. W: Boy, I can relate to that. Some people can eat whatever they want and they never seem to gain a pound. M: In this study, volunteers were given a thousand extra calories a day — about two cheeseburger's worth of extra intake. W: This kind of study I'd like to be in! M: Well, anyway, they also wore special devices that recorded how much they moved — you know, walking up and down steps. Everybody gained weight, but some people gained much less than others. The culprit? Fidgeting. W: You mean just drumming your fingers or scratching your neck or something? M: Any motion takes energy to perform. And little motions like rearranging things on your desk or stretching your hack, if you do them all the time, start to add up. We generally only think of large motions, like exercise, as burning calories. But people who have the fidgets may be doing a slow, steady burn all day long. According to the man, he used to be ______.