题目

Jim didn’t come back untill 12 last night, so his father        very late waiting for him.    A. stayed up   B. stayed away       C. stayed over        D. stayed  ahead 答案：A2．(2012·上海单科)下列食物营养成分与鉴定试剂及显色反应之间的对应关系中，错误的是(　　) A．淀粉：碘液，蓝紫色 B．还原糖：班氏试剂，红黄色 C．脂肪：苏丹Ⅲ染液，橘红色 D．蛋白质：双缩脲试剂，黄绿色