题目

阅读理解 Competitive eating has become big business.The International Federation of Competitive Eating (IFOCE) holds events forcompetitive eating all around the world. One of the most popular contests (竞赛) is held every 4th of July on Coney Island in New York. Nathan'sHot Dog Eating Contest started in 1916 and the event has been dominated (占据优势) by Takeru Kobayashi. The Japanese competitor set his firstrecord in 2001, when he ate 50 hot dogs in 12 minutes and has won the contestsix years in a row. The main types of food eaten in the contestsare fast food. Hot dogs, chicken wing2007年12月4日浙江省卫生厅公布的最常见的四种疾病中，高血压排在第一位，胆结石排在第二位，可见在全民社会中普及如何预防胆结石显得尤为重要。从化学上讲，非结合胆红素(VCB)分子有羟基，被氧化后（生成羧基）与钙离子结合形成胆红素钙的反应，就是一个生成沉淀的离子反应，从动态平衡的角度分析能预防胆结石的方法是 [     ]A．大量食用纯碱可使钙离子沉淀完全，预防胆结石产生B．不食用含钙的食品 C．适量服用维生素E、维生素C等抗氧化自由基可预防胆结石D．手术切除胆囊