题目

Lisa, now stop for a short break. You should know that you       all the morning. A. are working              B. had been working             C. have been working    D. have worked 答案：C 解析: 略“关爱生命，拥抱健康”是人类永恒的主题。下列说法不正确的是（   ） A．多食水果和蔬菜，给人体补充维生素 B．牛奶、豆浆是富含蛋白质的食品 C．大米、玉米是富含糖类的物质 D．胃酸过多的病人可以多喝碳酸饮料