题目

下列气体不能用固体的氢氧化钠干燥的是                         A.一氧化碳       B.氢气         C.二氧化碳          D.氧气 答案：C .—Have your working conditions improved? —No, _____ than before, I’m afraid. A．no better B．a little better C．not worse D．no worse