题目

When asked about happiness, we usually think of something extraordinary, an absolute delight, which seems to get rarer the older we get. For kids, happiness has a magical quality. Their delight at winning a race or getting a new bike is unreserved (毫无掩饰的). In the teenage years the concept of happiness changes. Suddenly it's conditional on such things as excitement, love and popularity. I can still recall the excitement of being invited to dance with the most attractive boy at the school party. In adulthood the things that bring deep joy—love, marriage, birth—also bring 小白早餐吃了一块馒头、一个煎鸡蛋．以下说法正确的是（　　）A. 馒头消化的起始部位是胃B. 吸收这些营养物质的主要器官是小肠C. 煎鸡蛋最终被消化成甘油和脂肪酸D. 这次早餐中主要的供能物质是蛋白质