题目

Accounting is described as ______ science of classifying, recording, and reporting ______ important financial events. A. a, the      B. a, /               C. /, /              D. /,   答案：B下列说法错误的是    A.用肥皂水可以区分硬水和软水    B.汽车轮胎是有机合成材料中的塑料制品    C.向NaOH溶液中滴加盐酸，所得溶液pH一定降低    D.混合物可能只由一种元素组成