题目

—I think students should have mobile phones to call their parents.    —________. They often use them to play games instead.    A. I hope so  B. I don’t agree  C. No problem   D. Good idea 答案：B下列说法正确的是 （    ） A. 凡在溶液中能电离出H+的化合物都属于酸 B. 酸性氧化物一定能和碱溶液反应生成盐和水 C. 化合物一定是电解质 D. 纯碱属于碱类