还原糖、脂肪、蛋白质和RNA四种有机物的鉴定实验中,选材或操作正确的是( ) A . 用斐林试剂检测胡萝卜汁中的还原糖 B . 向花生种子匀浆中滴加苏丹Ⅲ染液检测脂肪 C . 将双缩脲试剂A液与B液混合,摇匀后检测豆浆中的蛋白质 D . 常温条件下,核糖核酸与甲基绿作用,呈现绿色 答案:BThe thief ran away as fast as he could ______ the policeman.
A. in sight
B. within the sight of
C. within sight
D. at the sight of