阅读下面的材料，从每题所给的A、B、C、D四个选项中选出最佳选项。
Chinese people used to greet each other with "Have you had your meal？" to show their friendliness. Recently, however, a new greeting hasemergedin many Chinese cities, namely "Have you lost weight？".
Chen Xin, a manager of a company in Hangzhou, succeeded in losing weight. "Following instructions from my coach, I went on a diet （饮食） and lost 10 kilograms, " Chen said with satisfied smile.
In recent years, food-delivery （食物速递） services have been growing fast and entering every corner of Chinese cities. Also, Chinese people can easily get different kinds of foods from all over the world. But people are paying more and more attention to their health. Food written with "low calories" and "light food" are becoming popular. More people are becoming familiar with healthy ideas like "sugar cut-off" and "low-calorie Fast Diet plan".
Except for healthier, many people believe, to lose weight, it is not enough if you only control your food intake. Doing sports is also of great importance.
Jiang Yichen, a teacher at a university in Beijing, does sports in a training center if he finishes work early. "Doing sports provides me with energy, and energy brings me a lot of pleasure, " Jiang said. Like Jiang, many people like sports, and some even take fitness equipment （健身器材） home.
Over the past two years, the online sales of fitness equipment have increased quickly, especially among women who believe that it's important to manage the body, according to a 2019 survey on Email.
People even like to run marathons. In China's big cities, holding marathons has become a fashion. According to the China Marathon Annual Report, 1, 828 marathons were held nationwide in 2019, covering 31 provinces, with 7.12 million players.