题目

听材料，完成下列各小题。【1】What are the two speakers probably talking about?A.A singing exam. B.A written exam. C.An oral exam.【2】Why does the man ask the woman so many questions?A.He wants to be better-prepared.B.He wants to know how the result was.C.He wants to know if she knows the teacher.【3】What does the woman think of this exam?A.Interesting. B.Hard. C.Boring. 答案：【答案】【1】C【2】A【3】B【解析】【原文】略 下列物质露置于空气中不是因为发生氧化还原反应而变质的是 [　　] A． 氢硫酸 B． 烧碱溶液 C． 亚硫酸钠 D． 氯水