参考答案

正确答案：D
解析：本题问“主旨”，短文的第一段就介绍了文章的主要内容。“Fast food，a mainstay of Americaneating for decades，may have reached a plateau in the United States as the maturing babyboom generation looks for a more varied menu．Fast food still represents a $102 billion a year industry，butgrowth has turned sluggish recently amid tough competition from retail food stores and a more affluent population willing to try new things and spend more，analysts say．”短文起始两句说到了随着生育高峰期的那代父母开始寻求更加丰盛的食谱，快餐业趋于饱和。尽管快餐业每年仍能收益颇丰，但近年来随着食品零售业的发展，以及越来越多的人愿意尝试新东西，愿意花费更多钱，快餐业的发展实际呈下滑趋势。因此D“快餐正在失去吸引力”正确。